The same narration was told by Majzaa from a man called Uhban bin Aus who was one of those who had witnessed (the Pledge of allegiance beneath) the Tree., and who had some trouble in his knee so that while doing prostrations, he used to put a pillow underneath his knee.
Reference: Sahih al-Bukhari 4174 In-book : Book 64, Hadith 216 USC-MSA web (English) : Vol. 5, Book 59, Hadith 491 (deprecated)
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