BAYHAQI 16562:
from Ibn al-ʿAfīf —
[Machine] I saw Abu Bakr while he was giving allegiance to the people after the Messenger of Allah, ﷺ . A group gathered around him, and he said, "Will you pledge allegiance to me for listening and obeying Allah, His Book, and the leader?" They replied, "Yes", and he took their allegiance. I stood by him for a while, and at that time, I was either a youth or slightly older. I learned the condition that he set for the people. Then I approached him and said, starting with praising Allah, "I pledge allegiance to you for listening and obeying Allah, His Book, and the leader." He (Abu Bakr) raised his sight to the sky, then lowered it, and I saw that he was pleased with me. May Allah have mercy on him.
البيهقي ١٦٥٦٢:
عن ابن العفيف —
رَأَيْتُ أَبَا بَكْرٍ وَهُوَ يُبَايِعُ النَّاسَ بَعْدَ رَسُولِ اللهِ ﷺ فَيَجْتَمِعُ إِلَيْهِ الْعِصَابَةُ فَيَقُولُ تُبَايِعُونِي عَلَى السَّمْعِ وَالطَّاعَةِ لِلَّهِ وَلِكِتَابِهِ ثُمَّ لِلْأَمِيرِ؟ فَيَقُولُونَ نَعَمْ فَيُبَايعُهُمْ فَقُمْتُ عِنْدَهُ سَاعَةً وَأَنَا يَوْمَئِذٍ الْمُحْتَلِمُ أَوْ فَوْقَهُ فَتَعَلَّمْتُ شَرْطَهُ الَّذِي شَرَطَ عَلَى النَّاسِ ثُمَّ أَتَيْتُهُ فَقُلْتُ وَبَدَأْتُهُ قُلْتُ أَنَا أُبَايِعُكَ عَلَى السَّمْعِ وَالطَّاعَةِ لِلَّهِ وَلِكِتَابِهِ ثُمَّ لِلْأَمِيرِ فَصَعَّدَ فِيَّ الْبَصَرَ ثُمَّ صَوَّبَهُ وَرَأَيْتُ أَنِّي أَعْجَبْتُهُ رَحِمَهُ اللهُ
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