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 : Book 63, Hadith 116 USC-MSA web (English) : Vol. 5, Book 58, Hadith 230 (deprecated)
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