Is a summary of most of the Obligatory Knowledge every accountable person is obligated to know. This comprises the Obligatory Knowledge pertaining to belief, issues from Purification (Taharah) up to Pilgrimage (Hajj), and some rules of dealings according to the school (madhhab) of Imam ash-Shafi^iyy. The sins of the heart and of other organs, such as the tongue, are also included. The original book was written by the Hadramiyy faqih (scholar): ^Abdullah Ibn Husayn Ibn Tahir. Many precious issues were added to the book; what was mentioned about Sufism was omitted. Some sentences were changed in such a way that it would not change the subject. In a few cases the author mentioned what some Shafi^iyy scholars, like al-Bulqiniyy, preponderated in an effort to expose what was weak in the original book. One must pay due attention to this Obligatory Knowledge in order to have one's deeds accepted.