On the fundamentals of jurisprudence, in which Siraj al-Din Abi Hafs Umar bin Ali Ibn al-Mulaqqin (723/1323 - 804/1401) explained the book Minhaj of Imam al-Baidawi. Ibn al-Mulaqin clarifies its meanings, discloses its premises, provides evidences,extrapolates its overt and abstract ideas, explains other ideas as well as adds many important benefits. Ibn al-Muaqqin was a Shafi'i jurist, with expertise on Islamic law and hadith.