Kitab al-nasikh wa-l-mansukh of Abu ‘Ubaid al-Qasim b. Sallam

This text, which antedates the crystallization of the Schools of Fiqh and presents a view of the relation between the Qur'an and Sunnah diverging from that of Shafi'i is of relevance to studies of the Qur'an and the formation of Islamic jurisprudence.