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bukhari:3890ʿAlī b. ʿAbdullāh > Sufyān > Kān

I was present with my two maternal uncles at Al-ʿAqaba (where the pledge of allegiance was given). (Ibn 'Uyaina said, "One of the two was Al-Bara' bin Marur.")  

البخاري:٣٨٩٠حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ حَدَّثَنَا سُفْيَانُ قَالَ كَانَ عَمْرٌو يَقُولُ سَمِعْتُ جَابِرَ بْنَ عَبْدِ اللَّهِ ؓ يَقُولُ شَهِدَ بِي خَالاَىَ الْعَقَبَةَ قَالَ أَبُو عَبْدِ اللَّهِ قَالَ

ابْنُ عُيَيْنَةَ أَحَدُهُمَا الْبَرَاءُ بْنُ مَعْرُورٍ