(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) ."
Reference: Sahih al-Bukhari 4165 In-book : Book 64, Hadith 207 USC-MSA web (English) : Vol. 5, Book 59, Hadith 483 (deprecated)
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