Islam is built on five pillars (Hadith Sahih Bukhari Vol 1, Book 2, No 7 ), the first of which is a state of faith, the other four are major exercises of faith of which some are daily, some weekly, some monthly, some annually and some are required as a minimum once in a lifetime. These exercises of faith are to serve man's spiritual purposes, satisfy his human needs and to mark his whole life with a Divine touch. The five pillars of Islam are: