Mulla Ali Qari, a reputed Muslim theologian, caught the idea of collecting all the prayers which are contained in Holy Qur'an and au­thentic traditions and compiling them into a prayer-book for purpo­ses of recitation. This work was completed more than three centuries back and earned great popularity in the Muslim world, particularly the Indian sub-continent where it almost became part of the daily ritual for all pious persons. The original compiler had divided the collection into seven parts, one for each day of the week, in order to facilitate regular recitation.