Date: Unknown; probably late 10th century
Original Language: Arabic
Kitāb al-istidlāl is only known through an epitome (mukhtaṣar) preserved in a single Vatican manuscript; S.K. Samir has provided an extensive description of this epitome (Samir, ‘ʿAbd al-Masīḥ’), which is the basis for what follows.
After a philosophical introduction, the book is divided into five parts: 1. proofs of the c…