Sahih al-Bukhari 4165
صحيح البخاري#4165Sahihحَدَّثَنَا قَبِيصَةُ، حَدَّثَنَا سُفْيَانُ، عَنْ طَارِقٍ، قَالَ ذُكِرَتْ عِنْدَ سَعِيدِ بْنِ الْمُسَيَّبِ الشَّجَرَةُ فَضَحِكَ فَقَالَ أَخْبَرَنِي أَبِي وَكَانَ، شَهِدَهَا.
Narrated Tariq:(The tree where the Ridwan Pledge of allegiance was taken by the Prophet) was mentioned before Sa`id bin Al-Musaiyab. On that he smiled and said, "My father informed me (about it) and he had witnessed it (i.e. the Pledge)
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 64:207