This book presents a theory of maqbool hadith built by Abu Hamid Muhammad ibn Muhammad Al-Gazaly (450-505 H), a scholar of Sufism and a famous Islamic philosopher at the last 5th century in Hijriah. This book explains how exactly Abu Hamid Muhammad ibn Muhammad Al-Gazaly builds the theory to determine the hadiths which can be used as a legal proposition (law) to be implemented in the middle of Moslem society. He is well-known with the name of Al Gazaly. The theory built by Al Gazaly has certain characteristics that are different from the majority of Islamic scholars. This book is truly important to be read and explored by students whose major in Islamic law, Islamic law practitioners and for those who want to deepest Islamic legal theory. Many things explained in this book is very necessary and sensitive to be known as sacred guidance for all of the Moslem people around this world. There are many new knowledge and a clear understanding applied in this memorable book.