Ikhtiyar ma'rifat al-rijal

Ikhtiyār maʿrifat al-rijāl (Arabic: اختیار معرفة الرجال), also known as the Rijāl al-Kashshī (Arabic: رجال الکَشّي), is a Twelver Shi'ite work of biographical evaluation (ʿilm al-rijāl) originally written by Muhammad ibn Umar al-Kashshi (c. 854–941/951) and abridged by Shaykh Tusi (995–1067 CE).