3Abu hamid al-Ghazali discusses the fundamentals and inner meanings of the pilgrimage, including its pillars, preconditions, and obligations. The book begins with an introduction on the merits of the pilgrimage and its rewards. Al-Ghazali explains the Qur'anic statement announcing the pilgrimage: And proclaim to the people the pilgrimage; they will come to you on foot and on every lean camel; they will come from every distant pass--that they may witness benefits for themselves and mention the name of God on known days over what He has provided for them of [sacrificial] animals.