Sahih al-Bukhari, 4174

Rapporté par Majzaa, de la part d’un homme appelé Uhban bin Aus, qui faisait partie de ceux qui avaient assisté à l’allégeance sous l’Arbre, et qui avait un problème au genou. Lorsqu’il faisait la prosternation, il mettait un coussin sous son genou

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