That his father was amongst those who had given the Pledge of allegiance (to the Prophet (ﷺ) ) beneath the Tree, and the next year when they went towards the Tree, they were not able to recognize it.
Reference: Sahih al-Bukhari 4164 In-book : Book 64, Hadith 206 USC-MSA web (English) : Vol. 5, Book 59, Hadith 482 (deprecated)
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