A book in English in which Sh. Abderrahman Hasan Aal Ash-Sheikh comments on the Book of Monotheism authored by Imam Muhammad ibn Abdulwahhab. The book gives a clear explanation of the Muslim sound creed which is the core of Islam. The belief in monotheism is the purpose for which Allah created both mankind and jinn, and thus, those whose belief in monotheism is corrupt are not considered Muslims.