The Banu Nadir were a Jewish Arabian tribe that lived in northern Arabia at the oasis of Medina until the 7th century. They were probably a part of the Constitution of Medina, which was formed after Muhammad's Hijrah. Tensions rose between the Muslims and the Banu Nadir after the Battle of Uhud, which prompted a clash between the two, resulting in the expulsion of the latter. The tribe then planned the Battle of the Trench together with the Quraysh and later participated in the battle of Khaybar.