Ihya Ulum Al Din Vol 1
The book is a comprehensive encyclopaedia for all of a Muslim’s religious affairs,
"The book is a comprehensive encyclopaedia for all of a Muslim’s religious affairs, including beliefs, acts of worship, dealings and character, as well as for individual and societal welfare. Al-Ghazālī’s style is that of one who practices what he knows, one who is determined to rise from the dry, ordinary manner of teaching to one which encourages action. Volume one consists of ten Books covering Knowledge, The foundations of belief, The mysteries of cleanliness, Prayer, Zakah, Fasting, The secrets of pilgrimage, Recitation of the Qur’an, Invocations and supplications, and Regular devotions"
(Ihya Ulum Al Din 4 Volume Set $155)