ʿAbd Allāh b. Sinān, was an Imāmī jurist (faqīh) and traditionist (muḥaddith), as well as a companion of Jaʿfar b. Muḥammad al-Ṣādiq. Imāmī sources of ḥadīth, law (fiqh), ethics, and exegesis (tafsīr) quote him widely. His family were among the clients (mawālī) of the Banū Hāshim (al-Najāshī, 2/8–9). His father was a companion of Muḥammad b. ʿAlī al-Bāqir and Jaʿfar b. Muḥammad al-Ṣādiq, respectively the fifth and sixth Shiʿi imams (see al-Ṭūsī, al-Rijāl, 137). Al-Najāshī (2/8), who names Ṭarīf as ʿAbd Allāh's grandfather, seems to have confused ʿAbd Allāh's father …