(The tree where the Ridwan Pledge of allegiance was taken by the Prophet) was mentioned before Saʿid bin Al-Musaiyab. On that he smiled and said, "My father informed me (about it) and he had witnessed it (i.e. the Pledge) ."
أَخْبَرَنِي أَبِي وَكَانَ شَهِدَهَا