ʿAbd Allāh b. Ubayy, Abū Ḥubāb (d. Dhū al-Qaʿda 9/February 631), was a leading member of the tribe of Khazraj, from the town of Medina (Yathrib), who attained notoriety as a hypocrite (munāfiq) after the advent of Islam.

He was from the Banū Awf branch of the tribe of Khazraj (Ibn al-Kalbī, 1/414, 417). The name of his paternal grandmother, Salūl, usually appears after that of his father's in his lineage (Ibn Hishām, 2/89; Ibn Saʿd, 3/540; al-Balādhurī, Futūḥ, 92).

Some time before the Prophet's migration (hijra) to Medina, ʿAbd Allāh b. Ubayy was regarded as one of the leaders o…