question #3 Sahih al-Bukhari 4165, Book 64, Hadith 207 : What role do family narratives play in preserving the history of significant Islamic events?

(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) .”