Ibn Shihab al-Zuhri (may Allah have mercy on him) said: "Among those of the Ansar who were present at al-Aqabah, then from Banu Salamah, was Bishr bin al-Bara' bin Ma'rur. He is the one who ate with the Messenger of Allah (peace and blessings be upon him) from the sheep that was poisoned on the day of Khaybar."
Hadith Referenceالمعجم الكبير للطبراني / باب الباء / 1189