Urwah (may Allah have mercy on him) said: "Among those of the Ansar who pledged allegiance to the Messenger of Allah (peace and blessings be upon him) at al-Aqabah, then from Banu Salimah bin Yazid bin Jusham, was Bishr bin al-Bara' bin Ma'rur, and he also took part in Badr."
Hadith Referenceالمعجم الكبير للطبراني / باب الباء / 1188