Reference: Madārij as-Sālikīn Vol. 3 Page 450
All of the Qur’ān is regarding tawḥīd. [1]
This is because the Qur’ān is either:
1. Information regarding Allāh, the most-high, his names, his attributes, his actions and his statements. This is tawḥīd of knowledge and information [regarding him].
2. A call to worship him alone, he has no partners, and abandoning anything which is worshipped besides Him. This is Tawḥīd of one’s intent and seeking.
3. A command or a prohibition, and [an order to] maintain his obedience in his commands and prohibitions. This is from the rights of the tawḥīd and its perfection.
4. Information regarding how the people of tawḥīd were honoured, what happened to them in the worldly life and how they will be honoured in the Hereafter. This is the reward of tawḥīd.
5. Information regarding the people of shirk, what happened to them in the worldly life in terms of punishments; and what will happen to them in the final abode of punishment. This is the recompense of those who abandon the command of tawḥīd.
Thus, the Qur’ān in its entirety is regarding tawḥīd, its rights and rewards; and the state of shirk, its people and their recompense.
{Alḥamdulillāhi rabbil ‘ālamīn} {All praise is for Allah, the Lord of creation} is tawḥīd. [2]
{Ar-raḥmān ar-raḥīm} {The most-merciful, the bestowed of mercy} is tawḥīd.
{Māliki yawm id-dīn} {Sovereign of the Day of Recompense} is tawḥīd.
{Iyyāka na’budu} {You alone we worship} is tawḥīd.
{wa iyyāka nasta’īn) {Your help alone we seek} is tawḥīd.
{Ihdinas ṣirātal mustaqīm} {Guide us to the straight path} is tawḥīd, containing a request for guidance to the path of the people of tawḥīd whom Allāh has blessed;
{ghayril maghdūbi ‘alayhim wa laẓāleen} {not the path of those who evoked your anger, nor those who went astray} regarding those who left of tawḥīd.”
Footnotes
[1] The general meaning of tawḥīd is: The command to single out in all acts of worship and to single Him out in every quality, attribute and right which is exclusive to him.
[2] The author goes on to explain how the whole of Sūrah al-Fātiḥa is regarding tawḥīd. For a clarification of this, please read: https://madeenah.com/all-of-surah-fatihah-is-about-tawhid/
القرآن كله التوحيد
المرجع: مدارج السالكين بين منازل إياك نعبد وإياك نستعين
فإنَّ القرآنَ:
1- إمَّا خَبَرٌ عن اللهِ تعالى وأسمائِهِ وصفاتِهِ وأفعالِهِ وأقوالِهِ، فهوَ التوحيدُ العِلْميُّ الخبريّ.
2- وإمَّا دَعْوةٌ إلى عِبادتِهِ وحدَهُ لاَ شَرِيكَ لهُ، وخَلْعِ ما يُعْبَدُ مِنْ دُونِهِ، فهوَ التَّوحِيدُ الإرَادِيُّ الطَّلَبِيُّ.
3- وإمَّا أَمْرٌ ونَهْيٌ، وإلزامٌ بطاعتِهِ وأمرِهِ ونَهْيِهِ، فهوَ حقوقُ التوحيدِ ومُكَمِّلاتُهُ.
4- وإمَّا خَبَرٌ عنْ إكرامِ أهلِ التوحيدِ ومَا فُعِلَ بِهِم في الدُّنيا ومَا يُكَرِّمُهم بهِ في الآخِرَةِ، فهو جَزَاءُ تَوْحيدِهِ.
5- وإمَّا خَبَرٌ عنْ أهلِ الشرْكِ ومَا فُعِلَ بِهِم في الدُّنيا مِن النَّكالِ، ومَا يَحُلُّ بهم في العُقْبَى مِن العَذَابِ، فهوَ جَزَاءُ مَنْ خَرَجَ عَن حُكْمِ التوحيدِ.
فالقرآنُ كلُّهُ في التوحيدِ حقوقِهِ وجزائِهِ، وفي شَأْنِ الشِّرْكِ وأهْلِهِ وجَزَائِهِم وجزائهم.
{الحمد لله توحيد رب العالمين} توحيد
{الرحمن الرحيم} توحيد
{مالك يوم الدين} توحيد
{إياك نعبد} توحيد
{وإياك نستعين} توحيد
{اهدنا الصراط المستقيم} توحيد متضمن لسؤال الهداية إلى طريق أهل التوحيد الذين أنعم الله عليهم
{غير المغضوب عليهم ولا الضالين} الذين فارقوا التوحيد