What was the event that took place in the tree where the Prophet Muhammad (saw) took the Ridwan Pledge of allegiance?
 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) ."