«Al-Muharrir fi Fiqh al-Imam al-Shafi'i» by the Imam and jurist by Abu al-Qasim Abd al-Karim al-Rafi'i al-Qazwini (555/1160 - 623/1226) is considered one of the fundamental and seminal books of the Shafi'i school of thought. It is a well-known and respected book among the Shafi'is. Its importance stems from the great stature of its author among them. He was one of the two sheikhs (the other being al-Nawawi) to whom credit is due for the elaboration and refinement of the Shafi'i school of thought.