And Ahmad ibn Yusuf al-Azdi narrated to me, saying: 'Umar ibn Hafs ibn Ghiyath narrated to us, saying: My father narrated to us, on the authority of 'Asim, on the authority of 'Amir, on the authority of Ibn 'Abbas, who said: I do not know—whether the Messenger of Allah, peace and blessings be upon him, only forbade it because it was the people's beast of burden, and he disliked that their mounts should be lost, or whether he prohibited it on the day of Khaybar—the meat of domesticated donkeys.