Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Bukhari :: Book 5 :: Volume 59 :: Hadith 482
Narrated Said bin Al-Musaiyab:
That his father was amongst those who had given the Pledge of allegiance (to the Prophet ) beneath the Tree, and the next year when they went towards the Tree, they were not able to recognize it.
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