(43) باب وُفُودُ الأَنْصَارِ إِلَى النَّبِيِّ صلى الله عليه وسلم بِمَكَّةَ وَبَيْعَةُ الْعَقَبَةِ
Narrated Jabir bin `Abdullah:
I was present with my two maternal uncles at Al-`Aqaba (where the pledge of allegiance was given). (Ibn 'Uyaina said, "One of the two was Al-Bara' bin Marur.")
Reference: Sahih al-Bukhari 3890
In-book reference: Book 63, Hadith 116
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 5, Book 58, Hadith 230