This book gives a clear explanation of the sound Muslim Creed which is the core of the religion of Islam, as the belief in Tawhîd (monotheism) is the purpose for which Allah created both mankind and jinn, and thus, those whose belief in Tawhîd is corrupt, are not considered Muslims. It is a commentary on the Book of Tawhîd written by Sheikh Muhammad Ibn Abdul-Wahhâb. In this Book, Sheikh Sâlih Al-Fawzân has projected light on doctrinal issues of utmost importance in a genuine and reader-friendly style. This translated version of the book fulfills a long-standing need on the part of nglish-speaking Muslims for a brief, introductory book in Tawhîd. It is a valuable book for novice readers, be they Muslims or non-Muslims, who do not have thorough knowledge of the sound Muslim Creed. The chapters of this book focus on major issues in Tawhîd such as the definition of Tawhîd, virtue of Tawhîd, warning against acts of Shirk (polytheism), the Prophets maintenance of monotheism, and other topics.