Narrated Zahir Al-Aslami: (who was one of those who had witnessed (the Pledge of allegiance beneath) the Tree) While I was making fire beneath the cooking pots containing donkey's meat, the announcer of Allah's Apostle announced, "Allah's Apostle forbids you to eat donkey's meat."
Hadith Referenceصحيح البخاري / كتاب المغازي / 4173
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة
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.
Hadith Referenceصحيح البخاري / كتاب المغازي / 4174
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة