The Most Important Books on 'Aqeedah and Tawhid

Question:
He also says, may Allah bless you: I hope Shaykh Salih will mention the most important books that discuss 'aqidah (creed) and tawhid (the oneness of Allah), as we hope they will be comprehensive and sufficient so that we may be on clear guidance and certainty.

Answer:
Books on the correct creed are, praise be to Allah, numerous, abundant, and available. The greatest of them is the Book of Allah (Glorified and Exalted is He), for it is the reference for the creed and for other matters. After the Qur'an comes the Sunnah of the Messenger of Allah (peace and blessings be upon him) and his biography as found in the authentic hadiths reported from him. Also, the writings on the correct creed.
Such as the collection of fatwas of Shaykh al-Islam Ibn Taymiyyah. From this collection is the *Al-Wasitiyyah Creed* by Shaykh al-Islam Ibn Taymiyyah. The creed that covers the chapters of the creed and what Muslims must be upon in their dealings with one another. And from it is the book *Tawhid* by the Shaykh, the Imam, the reformer Muhammad ibn 'Abd al-Wahhab (may Allah have mercy on him), on the oneness of worship and the prohibition of shirk (associating partners with Allah).
And the prohibition of what affects the creed of tawhid (the oneness of Allah) from the Book and the Sunnah. All its chapters are based on the Book and the Sunnah: a verse from the Book of Allah, or a hadith from the Messenger of Allah (peace and blessings be upon him), or a report from the scholars of the Ummah. These are great books to which one must return, study, and teach, and they are, praise be to Allah, present in our schools and universities, from primary school to postgraduate studies, included in the curricula. Yes.