What is "al-hassaf"

Al-Ḫaṣṣāf (died 874, full name Abū-Bakr Aḥmad Ibn-ʿUmar Ibn-Muhair aš-Šaibānī al-Ḫaṣṣāf) was a Hanafite law scholar at the court of the 14th Abbasid caliph al-Muhtadi. He is the author of a seminal work on Qādī, known as ''. A commentary on the work was written by al-Jaṣṣās in the 10th century. An English translation was published by G. P. Verbit in 2008.

Al-Ḫaṣṣāf is also the author of a '' Kitāb al-ḥiyal wa-l-maḫārij'', a work on legalistic trickery or ḥiyal, and a kitāb aḥkām al-awqāf, on religious institutions or waqf.