Guide us to a book that clarifies the meaning of "La ilaha illa Allah" (There is no god but Allah), its conditions, its ranks, its nullifiers, and shirk (associating partners with Allah), kufr (disbelief), and nifaq (hypocrisy)?

Question:
Guide us to a book on the subject of Islamic creed that clarifies the following: the meaning of "La ilaha illa Allah," its conditions, its ranks, and its nullifiers. Then, that book should discuss shirk and its types, kufr and its types, and nifaq and its types. May Allah reward you with good.

Answer:
There is a comprehensive book on these topics mentioned by the questioner, and it is the book *Tawhid* by Shaykh al-Islam Muhammad ibn 'Abd al-Wahhab (may Allah have mercy on him), and its commentary *Fath al-Mujid* by Shaykh 'Abd al-Rahman ibn Hasan. It contains these topics that the questioner asked about, which are the clarification of the meaning of "La ilaha illa Allah," its implications, and its indications, as well as the testimony that Muhammad is the Messenger of Allah, its implications, and its indications. It also contains a clarification of shirk and its types, and chapters on types of major and minor shirk, and nifaq and warnings against it. So this book, praise be to Allah, is comprehensive regarding these topics. Yes.