What is Tawhid?
- Apr 4
- 15 min read
Updated: Jun 20

Its Meaning, Categories, Evidences, and Place in the Religion of Islam
Tawhid is the foundation of Islam, the first obligation upon the servant, the purpose for which the jinn and mankind were created, and the message with which Allah sent every Messenger and Prophet and the first thing they called their nations to was the worship of Allah Alone without any partners.
Allah تعالى said:
وَمَا خَلَقْتُ الْجِنَّ وَالْإِنسَ إِلَّا لِيَعْبُدُونِ
“I did not create the jinn and mankind except that they should worship Me.”
[Reference: Surah al-Dhariyat, 51:56]
Allah تعالى said:
وَلَقَدْ بَعَثْنَا فِي كُلِّ أُمَّةٍ رَّسُولًا أَنِ اعْبُدُوا اللَّهَ وَاجْتَنِبُوا الطَّاغُوتَ
“We certainly sent into every nation a Messenger, saying: Worship Allah and avoid the taghut.”
[Reference: Surah al-Nahl, 16:36]
Allah تعالى said:
وَمَا أَرْسَلْنَا مِن قَبْلِكَ مِن رَّسُولٍ إِلَّا نُوحِي إِلَيْهِ أَنَّهُ لَا إِلَٰهَ إِلَّا أَنَا فَاعْبُدُونِ
“We did not send any Messenger before you except that We revealed to him: None has the right to be worshipped except Me, so worship Me.”
[Reference: Surah al-Anbiya, 21:25]
Muʿadh ibn Jabal رضي الله عنه reported that the Prophet ﷺ said:
حَقُّ اللَّهِ عَلَى الْعِبَادِ أَنْ يَعْبُدُوهُ وَلَا يُشْرِكُوا بِهِ شَيْئًا
“The right of Allah over the servants is that they worship Him and do not associate anything with Him.”
[Reference: Sahih al-Bukhari, no. 2856; Sahih Muslim, no. 30]
Therefore, Tawhid is not merely one subject among the subjects of Islam. It is the foundation upon which the entire religion stands. Every command, prohibition and act of worship returns to the fulfillment and protection of Tawhid.
The Linguistic Meaning of Tawhid
The Arabic word Tawhid—التوحيد is the verbal noun of:
وَحَّدَ – يُوَحِّدُ – تَوْحِيدًا
It means to make something one, to declare it to be one, or to single it out from everything else.
Shaykh Muḥammad ibn Salih al-ʿUthaymin رحمه الله said:
التوحيد لغة: مصدر وحَّد يوحِّد، أي: جعل الشيء واحدًا، وهذا لا يتحقق إلا بنفي وإثبات، نفي الحكم عما سوى الموحَّد، وإثباته له.
“Tawhid linguistically is the verbal noun of waḥḥada–yuwaḥḥidu, meaning to make something one. This is not realized except through negation and affirmation: negating the ruling from everything besides the one being singled out, and affirming it for him.”
[Reference: Al-Qawl al-Mufid ʿala Kitab al-Tawhid, 1/11]
If a person merely says, “Zayd is standing,” he has affirmed standing for Zayd, but he has not denied that others may also be standing. However, when he says, “No one is standing except Zayd,” he has negated standing from everyone else and affirmed it exclusively for Zayd.
Likewise, Tawhid is established through negation and affirmation:
لَا إِلَٰهَ
— Negation of the right of worship from everything besides Allah.
إِلَّا اللَّهُ
— Affirmation that worship belongs exclusively to Allah.
The Sharʿi Definition of Tawhid
The comprehensive Sharʿi definition of Tawhid is:
إفراد الله بما يختص به من الربوبية والألوهية والأسماء والصفات
“Singling out Allah in that which is exclusive to Him of Lordship, worship, Names and Attributes.”
Shaykh ʿAbd al-ʿAziz ibn Baz رحمه الله said:
التوحيد: اعتقاد أن الله واحد لا شريك له، لا في ربوبيته، ولا في أسمائه وصفاته، ولا في عبادته.
“Tawhid is to believe that Allah is One and has no partner: not in His Lordship, not in His Names and Attributes, and not in His worship.”
[Reference: Sharh Kitab al-Tawhid, lesson one]
Shaykh al-Islam Muḥammad ibn ʿAbd al-Wahhab رحمه الله defined the Tawhid for which the Messengers were sent by saying:
اعلم رحمك الله أن التوحيد هو إفراد الله بالعبادة، وهو دين الرسل الذي أرسلهم الله به إلى عباده.
“Know—may Allah have mercy upon you—that Tawhid is to single out Allah in worship, and it is the religion of the Messengers with which Allah sent them to His servants.”
[Reference: Kashf al-Shubuhat]
There is no contradiction between these two definitions.
The first definition comprehensively includes the three categories of Tawhid. The second emphasizes Tawhid al-Uluhiyyah, because singling out Allah in worship was the primary matter over which the Messengers disputed with their nations.
The Meaning of La ilaha illa Allah
The correct meaning of: لَا إِلَٰهَ إِلَّا اللَّهُ
is: لَا مَعْبُودَ بِحَقٍّ إِلَّا اللَّهُ
“There is no one truly deserving/worthy of worship in truth except Allah alone.”
It does not merely mean:
There is no Creator except Allah.
There is no Lord except Allah.
There is no existing deity except Allah.
There is no one capable of creating except Allah.
The disbelievers of Quraysh generally acknowledged that Allah was their Creator, Provider and Controller, but they refused to abandon the worship of others besides Him.
Allah تعالى said:
ذَٰلِكَ بِأَنَّ اللَّهَ هُوَ الْحَقُّ وَأَنَّ مَا يَدْعُونَ مِن دُونِهِ هُوَ الْبَاطِلُ وَأَنَّ اللَّهَ هُوَ الْعَلِيُّ الْكَبِيرُ
“That is because Allah is the Truth, and whatever they invoke besides Him is falsehood, and because Allah is the Most High, the Most Great.”
[Reference: Surah al-Hajj, 22:62]
Allah تعالى said:
فَمَن يَكْفُرْ بِالطَّاغُوتِ وَيُؤْمِن بِاللَّهِ فَقَدِ اسْتَمْسَكَ بِالْعُرْوَةِ الْوُثْقَىٰ
“Whoever rejects the taghut and believes in Allah has grasped the firmest handhold.”
[Reference: Surah al-Baqarah, 2:256]
This verse contains the two pillars of Tawhid:
Rejecting the taghut: negating worship from everything besides Allah.
Believing in Allah: affirming worship for Allah alone.
The Prophet ﷺ said:
مَنْ قَالَ لَا إِلَهَ إِلَّا اللَّهُ، وَكَفَرَ بِمَا يُعْبَدُ مِنْ دُونِ اللَّهِ، حَرُمَ مَالُهُ وَدَمُهُ، وَحِسَابُهُ عَلَى اللَّهِ
“Whoever says, ‘None has the right to be worshipped except Allah,’ and rejects whatever is worshipped besides Allah, his wealth and blood become inviolable, and his account is with Allah.”
[Reference: Sahih Muslim, no. 23]
The Messenger of Allah ﷺ did not mention the utterance alone. He joined it to rejection of everything worshipped besides Allah.
The people of Quraysh understood that this testimony required them to abandon every object of worship besides Allah. Therefore, they said:
أَجَعَلَ الْآلِهَةَ إِلَٰهًا وَاحِدًا إِنَّ هَٰذَا لَشَيْءٌ عُجَابٌ
“Has he made all the objects of worship into one object of worship? Indeed, this is a remarkable thing.”
[Reference: Surah Sad, 38:5]
Their objection demonstrates that they understood La ilaha illa Allah to require the abandonment of all worship besides Allah—not merely the acknowledgement that Allah is the Creator.
The Three Categories of Tawhid
The scholars did not invent three separate forms. Rather, they examined the Qurʾan and Sunnah and found that the texts concerning Tawhid return to three subjects:
Allah’s actions.
The servants’ worship of Allah.
Allah’s Names and Attributes.
These were termed:
Tawhid al-Rububiyyah
Tawhid al-Uluhiyyah
Tawhid al-Asmaʾ wa-Sifat
Shaykh Ibn Baz رحمه الله said:
أقسام التوحيد ثلاثة: توحيد الإلهية، وتوحيد الربوبية، وتوحيد الأسماء والصفات.
“The categories of Tawhid are three: Tawhid of worship, Tawhid of Lordship, and Tawhid of the Names and Attributes.”
[Reference: Majmuʿ Fatawa Ibn Baz]
These three meanings are gathered in the statement of Allah تعالى:
رَبُّ السَّمَاوَاتِ وَالْأَرْضِ وَمَا بَيْنَهُمَا فَاعْبُدْهُ وَاصْطَبِرْ لِعِبَادَتِهِ هَلْ تَعْلَمُ لَهُ سَمِيًّا
“Lord of the heavens and the earth and whatever is between them, so worship Him and remain steadfast in His worship. Do you know of anyone comparable to Him?”
[Reference: Surah Maryam, 19:65]
The verse contains:
Tawhid al-Rububiyyah: “Lord of the heavens and the earth.”
Tawhid al-Uluhiyyah: “So worship Him.”
Tawhid al-Asmaʾ wa-Sifat: “Do you know of anyone comparable to Him?”
The terminology was formulated for teaching and clarification. The meanings themselves are found throughout the Qurʾān and Sunnah.
First: Tawhid al-Rububiyyah
Tawhid al-Rububiyyah is: إفراد الله بأفعاله
“Singling out Allah in His Lordship and actions.”
It is to believe that Allah alone is:
The Creator.
The Provider.
The Owner.
The One who gives life and causes death.
The Controller and Manager of all affairs.
The One who brings benefit and repels harm by His decree.
The One in whose Hand is the dominion of everything.
Allah تعالى said:
اللَّهُ خَالِقُ كُلِّ شَيْءٍ وَهُوَ عَلَىٰ كُلِّ شَيْءٍ وَكِيلٌ
“Allah is the Creator of everything, and He is the Disposer of all affairs.”
[Reference: Surah al-Zumar, 39:62]
Allah تعالى said:
أَلَا لَهُ الْخَلْقُ وَالْأَمْرُ تَبَارَكَ اللَّهُ رَبُّ الْعَالَمِينَ
“Unquestionably, creation and command belong to Him. Blessed is Allah, Lord of all creation.”
[Reference: Surah al-Aʿraf, 7:54]
Allah تعالى said:
قُلْ مَن يَرْزُقُكُم مِّنَ السَّمَاءِ وَالْأَرْضِ أَمَّن يَمْلِكُ السَّمْعَ وَالْأَبْصَارَ وَمَن يُخْرِجُ الْحَيَّ مِنَ الْمَيِّتِ وَيُخْرِجُ الْمَيِّتَ مِنَ الْحَيِّ وَمَن يُدَبِّرُ الْأَمْرَ فَسَيَقُولُونَ اللَّهُ فَقُلْ أَفَلَا تَتَّقُونَ
“Say: Who provides for you from the heaven and the earth? Who controls hearing and sight? Who brings the living out of the dead and brings the dead out of the living? Who controls every affair? They will say: Allah. Then say: Will you not fear Him?”
[Reference: Surah Yunus, 10:31]
The polytheists acknowledged Allah’s Lordship
Allah تعالى said:
وَلَئِن سَأَلْتَهُم مَّنْ خَلَقَ السَّمَاوَاتِ وَالْأَرْضَ لَيَقُولُنَّ اللَّهُ
“If you were to ask them who created the heavens and the earth, they would certainly say: Allah.”
[Reference: Surah Luqman, 31:25]
Their acknowledgement that Allah was the Creator did not enter them into Islam because they directed acts of worship to others besides Him.
Ibn al-Qayyim رحمه الله said:
توحيد الألوهية هو المنجِّي من الشرك دون توحيد الربوبية بمجرده؛ فإن عباد الأصنام كانوا مقرين بأن الله وحده خالق كل شيء وربه ومليكه، ولكن لما لم يأتوا بتوحيد الألوهية، وهو عبادته وحده لا شريك له، لم ينفعهم توحيد ربوبيته.
“Tawhid al-Uluhiyyah is what saves from shirk, not Tawhid al-Rububiyyah by itself. The worshippers of idols acknowledged that Allah alone was the Creator, Lord and Owner of everything. However, because they did not fulfil Tawhid al-Uluhiyyah—which is to worship Him alone without any partner—their acknowledgement of His Lordship did not benefit them.”
[Reference: ʿUddat al-Sabirin]
Thus, acknowledging that Allah exists or that He created the universe is not the complete Tawhid brought by the Prophets and Messengers.
Second: Tawhid al-Uluhiyyah
Tawhid al-Uluhiyyah is also called Tawhid al-ʿIbadah.
It is: إفراد الله بالعبادة
“Singling out Allah alone (truthfully) in every act of worship.”
Tawhid al-Uluhiyyah relates to the actions of the servants. Every act that Allah loves and has commanded must be directed to Allah alone.
This includes:
Salah.
Duʿaʾ.
Sacrifice.
Vows.
Seeking supernatural rescue.
Reliance.
Fear that is worship.
Hope.
Love that is worship.
Repentance.
Seeking forgiveness.
Humility and submission.
Seeking refuge.
Seeking aid in matters that only Allah can accomplish.
Allah تعالى said:
قُلْ إِنَّ صَلَاتِي وَنُسُكِي وَمَحْيَايَ وَمَمَاتِي لِلَّهِ رَبِّ الْعَالَمِينَ لَا شَرِيكَ لَهُ وَبِذَٰلِكَ أُمِرْتُ وَأَنَا أَوَّلُ الْمُسْلِمِينَ
“Say: Indeed, my prayer, my sacrifice, my living and my dying are for Allah, Lord of all creation. He has no partner. With this I have been commanded, and I am the first of those who submit.”
[Reference: Surah al-Anʿam, 6:162–163]
Allah تعالى said:
وَأَنَّ الْمَسَاجِدَ لِلَّهِ فَلَا تَدْعُوا مَعَ اللَّهِ أَحَدًا
“The places of worship belong to Allah, so do not invoke anyone together with Allah.”
[Reference: Surah al-Jinn, 72:18]
The Prophet ﷺ said:
الدُّعَاءُ هُوَ الْعِبَادَةُ
“Supplication is worship.”
He then recited:
وَقَالَ رَبُّكُمُ ادْعُونِي أَسْتَجِبْ لَكُمْ إِنَّ الَّذِينَ يَسْتَكْبِرُونَ عَنْ عِبَادَتِي سَيَدْخُلُونَ جَهَنَّمَ دَاخِرِينَ
“Your Lord said: Invoke Me; I will answer you. Indeed, those who are too arrogant to worship Me will enter Hell humiliated.”
[Reference: Surah Ghafir, 40:60; Sunan Abi Dawud, no. 1479; Jamiʿ al-Tirmidhi, no. 3247, Sahih]
Therefore, directing duʿāʾ to the dead, absent saints, angels, prophets or any created being concerning that which only Allah can accomplish is worship of other than Allah.
This was the central matter over which the Messengers disputed with their nations.
Allah تعالى said concerning Nuh, Hud, Sālih and Shuʿayb عليهم السلام:
يَا قَوْمِ اعْبُدُوا اللَّهَ مَا لَكُم مِّنْ إِلَٰهٍ غَيْرُهُ
“O my people, worship Allah. You have no true object of worship besides Him.”
[Reference: Surah al-Aʿraf, 7:59, 65, 73 and 85]
Third: Tawhid al-Asmaʾ wal-Sifat
Tawhid al-Asmaʾ wa-l-Sifat is to affirm every Name and Attribute that Allah affirmed for Himself in the Qurʾan, and that His Messenger ﷺ affirmed for Him in the authentic Sunnah, in a manner befitting Allah’s majesty.
They are affirmed:
Without taḥrīf: distorting their words or meanings.
Without taʿṭīl: denying or emptying them of their meanings.
Without takyīf: claiming to know how Allah’s Attributes are.
Without tamthīl: likening Allah’s Attributes to the attributes of creation.
Allah تعالى said:
لَيْسَ كَمِثْلِهِ شَيْءٌ وَهُوَ السَّمِيعُ الْبَصِيرُ
“There is nothing comparable to Him, and He is the All-Hearing, the All-Seeing.”
[Reference: Surah al-Shura, 42:11]
The beginning of the verse negates resemblance, while its ending affirms Allah’s Attributes of hearing and sight. Ahl al-Sunnah therefore combine affirmation with transcendence: they neither resemble Allah to His creation nor deny what He affirmed for Himself.
Allah تعالى said:
وَلِلَّهِ الْأَسْمَاءُ الْحُسْنَىٰ فَادْعُوهُ بِهَا وَذَرُوا الَّذِينَ يُلْحِدُونَ فِي أَسْمَائِهِ
“To Allah belong the Most Beautiful Names, so invoke Him by them, and leave those who deviate concerning His Names.”
[Reference: Surah al-Aʿraf, 7:180]
Allah تعالى said:
قُلْ هُوَ اللَّهُ أَحَدٌ اللَّهُ الصَّمَدُ لَمْ يَلِدْ وَلَمْ يُولَدْ وَلَمْ يَكُن لَّهُ كُفُوًا أَحَدٌ
“Say: He is Allah, the One. Allah, the Self-Sufficient Master upon whom all depend. He neither begets nor was He begotten. And there is none comparable to Him.”
[Reference: Surah al-Ikhlas, 112:1–4]
The way of the Salaf regarding Allah’s Attributes
Imām al-Awzaʿi رحمه الله said:
كُنَّا وَالتَّابِعُونَ مُتَوَافِرُونَ نَقُولُ: إِنَّ اللَّهَ تَعَالَى ذِكْرُهُ فَوْقَ عَرْشِهِ، وَنُؤْمِنُ بِمَا وَرَدَتْ بِهِ السُّنَّةُ مِنْ صِفَاتِهِ جَلَّ وَعَلَا.
“We and the Tabiʿin—while they were numerous—would say: Indeed, Allah, exalted is His mention, is above His Throne, and we believe in what has been transmitted in the Sunnah concerning His Attributes.”
[Reference: Al-Bayhaqi, al-Asmaʾ wa-l-Sifat, p. 408]
When Imām Mālik ibn Anas رحمه الله was asked how Allah rose over His Throne, he said:
الِاسْتِوَاءُ غَيْرُ مَجْهُولٍ، وَالْكَيْفُ غَيْرُ مَعْقُولٍ، وَالْإِيمَانُ بِهِ وَاجِبٌ، وَالسُّؤَالُ عَنْهُ بِدْعَةٌ.
“The rising is not unknown, its manner is not comprehensible, believing in it is obligatory, and asking how it occurred is an innovation.”
[Reference: Al-Bayhaqi, al-Asmaʾ wa-l-Sifat, no. 867]
The meaning of the Attribute is known from the Arabic language. Its actual manner is known only to Allah.
The Three Categories Are inseparable
The three categories are not independent beliefs that can be separated from one another. Each category requires and confirms the others.
Allah تعالى said:
ذَٰلِكُمُ اللَّهُ رَبُّكُمْ لَا إِلَٰهَ إِلَّا هُوَ خَالِقُ كُلِّ شَيْءٍ فَاعْبُدُوهُ وَهُوَ عَلَىٰ كُلِّ شَيْءٍ وَكِيلٌ
“That is Allah, your Lord. None has the right to be worshipped except Him, the Creator of everything, so worship Him. He is the Disposer of all affairs.”
[Reference: Surah al-Anʿam, 6:102]
The verse joins:
His Lordship: “Your Lord.”
His sole right to worship: “None has the right to be worshipped except Him.”
His creation: “The Creator of everything.”
The command to worship Him: “So worship Him.”
His perfect control: “He is the Disposer of all affairs.”
The One who alone creates, provides, owns and controls is the only One entitled to worship.
Tawhid Is the First Obligation
Allah تعالى said:
فَاعْلَمْ أَنَّهُ لَا إِلَٰهَ إِلَّا اللَّهُ
“Know that none has the right to be worshipped except Allah.”
[Reference: Surah Muhammad, 47:19]
When the Prophet ﷺ sent Muʿadh ibn Jabal رضي الله عنه to Yemen, he said:
فَلْيَكُنْ أَوَّلَ مَا تَدْعُوهُمْ إِلَيْهِ شَهَادَةُ أَنْ لَا إِلَهَ إِلَّا اللَّهُ وَأَنِّي رَسُولُ اللَّهِ
“Let the first matter to which you invite them be the testimony that none has the right to be worshipped except Allah and that I am the Messenger of Allah.”
[Reference: Sahih al-Bukhari, no. 1395]
In another wording:
فَلْيَكُنْ أَوَّلَ مَا تَدْعُوهُمْ إِلَى أَنْ يُوَحِّدُوا اللَّهَ
“Let the first matter to which you invite them be that they single out Allah (in worship).”
[Reference: Sahih al-Bukhari, no. 7372]
Shaykh Ibn Baz رحمه الله said:
فأول واجب وأعظم واجب هو هذا التوحيد، توحيد الله بالعبادة، والإيمان بأنه الإله الحق والمستحق للعبادة.
“The first obligation and the greatest obligation is this Tawḥīd: singling out Allah in worship and believing that He is the true God who alone deserves worship.”
Al-Tawhid: Fadluhu wa-Anwaʿuhu wa-Hukmuhu
Therefore, daʿwah, education and reform must begin with Tawḥīd, just as the Messengers began with it.
Tawhid Is Not a Word Uttered Without Knowledge and Submission
The testimony La ilaha illa Allah benefits the person who understands its meaning, believes it with certainty, accepts it, submits to it, speaks it truthfully, worships Allah sincerely, loves what it signifies, and rejects everything worshipped besides Allah.
The Prophet ﷺ said:
مَنْ مَاتَ وَهُوَ يَعْلَمُ أَنَّهُ لَا إِلَهَ إِلَّا اللَّهُ دَخَلَ الْجَنَّةَ
“Whoever dies knowing that none has the right to be worshipped except Allah will enter Paradise.”
[Reference: Sahih Muslim, no. 26]
Knowledge is expressly mentioned.
The Prophet ﷺ also said:
مَنْ قَالَ لَا إِلَهَ إِلَّا اللَّهُ، وَكَفَرَ بِمَا يُعْبَدُ مِنْ دُونِ اللَّهِ، حَرُمَ مَالُهُ وَدَمُهُ، وَحِسَابُهُ عَلَى اللَّهِ
“Whoever says, ‘None has the right to be worshipped except Allah,’ and rejects what is worshipped besides Allah, his wealth and blood become inviolable, and his account is with Allah.”
[Reference: Sahih Muslim, no. 23]
Wahb ibn Munabbih رحمه الله was asked:
أَلَيْسَ لَا إِلَهَ إِلَّا اللَّهُ مِفْتَاحَ الْجَنَّةِ؟
“Is not La ilaha illa Allah the key to Paradise?”
He answered:
بَلَى، وَلَكِنْ لَيْسَ مِفْتَاحٌ إِلَّا لَهُ أَسْنَانٌ، فَإِنْ جِئْتَ بِمِفْتَاحٍ لَهُ أَسْنَانٌ فُتِحَ لَكَ، وَإِلَّا لَمْ يُفْتَحْ لَكَ.
“Yes, but there is no key except that it has teeth. If you bring a key that has teeth, it will open for you; otherwise, it will not open for you.”
[Reference: Sahih al-Bukhari, Kitab al-Janaʾiz, chapter heading before no. 1237]
The “teeth” of the key are its requirements: knowledge, belief, sincerity, submission and fulfilment of what the testimony necessitates.
Tawhid Must Be Joined With Following the Messenger ﷺ
Sincerity to Allah alone is not sufficient if an act was not legislated by the Messenger ﷺ. Likewise, outward conformity to the Sunnah does not benefit a person whose worship is directed to other than Allah.
Allah تعالى said:
فَمَن كَانَ يَرْجُو لِقَاءَ رَبِّهِ فَلْيَعْمَلْ عَمَلًا صَالِحًا وَلَا يُشْرِكْ بِعِبَادَةِ رَبِّهِ أَحَدًا
“Whoever hopes to meet his Lord, let him perform righteous deeds and not associate anyone in the worship of his Lord.”
[Reference: Sahih al-Kahf, 18:110]
The verse contains the two conditions for an act of worship to be accepted:
“Let him perform righteous deeds”: the deed must agree with the Sunnah.
“Do not associate anyone in the worship of his Lord”: the deed must be sincerely for Allah.
Al-Fuḍayl ibn ʿIyad رحمه الله said concerning the statement of Allah, “which of you is best in deed”:
أَخْلَصُهُ وَأَصْوَبُهُ، فَإِنَّ الْعَمَلَ إِذَا كَانَ خَالِصًا وَلَمْ يَكُنْ صَوَابًا لَمْ يُقْبَلْ، وَإِذَا كَانَ صَوَابًا وَلَمْ يَكُنْ خَالِصًا لَمْ يُقْبَلْ، حَتَّى يَكُونَ خَالِصًا صَوَابًا، وَالْخَالِصُ أَنْ يَكُونَ لِلَّهِ، وَالصَّوَابُ أَنْ يَكُونَ عَلَى السُّنَّةِ.
“The most sincere and the most correct. If the deed is sincere but not correct, it will not be accepted. If it is correct but not sincere, it will not be accepted, until it is both sincere and correct. Sincere means that it is for Allah, and correct means that it is upon the Sunnah.”
[Reference: Abu Nuʿaym, Hilyat al-Awliyaʾ, 8/95]
Thus:
The testimony that none has the right to be worshipped except Allah requires sincerity to Allah.
The testimony that Muhammad is the Messenger of Allah requires following the Messenger ﷺ.
The Fruits of Tawhid
Security and guidance
Allah تعالى said:
الَّذِينَ آمَنُوا وَلَمْ يَلْبِسُوا إِيمَانَهُم بِظُلْمٍ أُولَٰئِكَ لَهُمُ الْأَمْنُ وَهُم مُّهْتَدُونَ
“Those who believe and do not mix their faith with wrongdoing—for them is security, and they are rightly guided.”
[Reference: Surah al-Anʿam, 6:82]
When this verse became difficult for the Companions, the Prophet ﷺ explained that the “wrongdoing” intended here was shirk. He recited:
يَا بُنَيَّ لَا تُشْرِكْ بِاللَّهِ إِنَّ الشِّرْكَ لَظُلْمٌ عَظِيمٌ
“O my son, do not associate anything with Allah. Indeed, shirk is a tremendous injustice.”
[Reference: Surah Luqman, 31:13; Sahih al-Bukhari, no. 3360; Sahih Muslim, no. 124]
Complete Tawhid produces complete security and guidance. Deficiency in obligatory Tawhid results in deficiency according to the servant’s sins and injustice.
Entrance into Paradise
The Prophet ﷺ said:
مَنْ لَقِيَ اللَّهَ لَا يُشْرِكُ بِهِ شَيْئًا دَخَلَ الْجَنَّةَ
“Whoever meets Allah without associating anything with Him will enter Paradise.”
[Reference: Sahih al-Bukhari, no. 129]
The people of Tawhid may differ greatly in the completeness of their faith and obedience. A Muslim who dies upon Tawhid but with major sins beneath shirk is under the will of Allah: if Allah wills, He forgives him; and if He wills, He punishes him according to his sins. He will not remain eternally in the Fire as one who died upon major shirk will.
Allah تعالى said:
إِنَّ اللَّهَ لَا يَغْفِرُ أَن يُشْرَكَ بِهِ وَيَغْفِرُ مَا دُونَ ذَٰلِكَ لِمَن يَشَاءُ
“Indeed, Allah does not forgive that partners be associated with Him, but He forgives what is less than that for whomever He wills.”
[Reference: Surah al-Nisaʾ, 4:48]
Shirk Is the Greatest Sin
ʿAbdullāh ibn Masʿūd رضي الله عنه asked the Prophet ﷺ:
أَيُّ الذَّنْبِ أَعْظَمُ عِنْدَ اللَّهِ؟
“Which sin is greatest with Allah?”
He ﷺ answered:
أَنْ تَجْعَلَ لِلَّهِ نِدًّا وَهُوَ خَلَقَكَ
“That you appoint a rival for Allah while He created you.”
[Reference: Sahih al-Bukhari, no. 4477; Sahih Muslim, no. 86]
Major shirk nullifies all deeds and, if a person dies upon it without repentance, prevents Paradise.
Allah تعالى said:
وَلَقَدْ أُوحِيَ إِلَيْكَ وَإِلَى الَّذِينَ مِن قَبْلِكَ لَئِنْ أَشْرَكْتَ لَيَحْبَطَنَّ عَمَلُكَ وَلَتَكُونَنَّ مِنَ الْخَاسِرِينَ
“It has certainly been revealed to you and to those before you: If you associate partners with Allah, your deeds will surely become worthless, and you will certainly be among the losers.”
[Reference: Surah al-Zumar, 39:65]
Allah تعالى said:
إِنَّهُ مَن يُشْرِكْ بِاللَّهِ فَقَدْ حَرَّمَ اللَّهُ عَلَيْهِ الْجَنَّةَ وَمَأْوَاهُ النَّارُ
“Whoever associates partners with Allah, Allah has forbidden Paradise for him, and his destination is the Fire.”
[Reference: Surah al-Maʾidah, 5:72]
Minor shirk does not remove a Muslim from Islam, but it is among the gravest sins and may invalidate the particular deed in which it occurs.
In the Hadith Qudsi, Allah تعالى said:
أَنَا أَغْنَى الشُّرَكَاءِ عَنِ الشِّرْكِ، مَنْ عَمِلَ عَمَلًا أَشْرَكَ فِيهِ مَعِيَ غَيْرِي تَرَكْتُهُ وَشِرْكَهُ
“I am the One most free of any need for partners. Whoever performs a deed in which he associates someone else with Me, I abandon him and his association.”
[Reference: Sahih Muslim, no. 2985]
Conclusion
Tawhid is to single out Allah alone:
In His Lordship.
In His right to be worshipped.
In His Names and Attributes.
It is built upon negation and affirmation:
لَا إِلَٰهَ — no created being possesses any right to worship
إِلَّا اللَّهُ — every act of worship belongs exclusively to Allah
Tawhid was the call of every Messenger. It is the first obligation, the greatest command, the right of Allah over His servants, the key to Paradise, the cause of security and guidance, and the distinction between Islam and shirk.
It is not fulfilled merely by acknowledging Allah as Creator. Nor is it fulfilled by uttering the testimony without understanding, sincerity, submission and rejection of everything worshipped besides Allah.
The servant must worship Allah alone, according to the guidance of the Messenger of Allah ﷺ, upon the understanding of the Companions and those who followed them in righteousness.
Allah تعالى said:
فَاعْبُدِ اللَّهَ مُخْلِصًا لَّهُ الدِّينَ أَلَا لِلَّهِ الدِّينُ الْخَالِصُ
“So worship Allah, making the religion sincerely and exclusively for Him. Unquestionably, the pure religion belongs to Allah alone.”
[Reference: Surah al-Zumar, 39:2–3]
May Allah establish us upon pure Tawhid, protect us from major and minor shirk, grant us sincerity in worship, and cause us to die upon La ilaha illa Allah, following the Sunnah of His Messenger ﷺ.
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