Musnad Ahmad 215:1

'Abd al-Samad narrated to us, Harb ibn Shaddad narrated to us, Yahya—meaning Ibn Abi Kathir—narrated to us, he said: Nahhaz ibn Juday al-Hanafi narrated to me, from Sinan ibn Salamah, that his father narrated to him: "That the Messenger of Allah, peace and blessings of Allah be upon him, ordered the cooking pots, so they were overturned on the day of Khaybar, and there was in them the meat of the domestic donkeys."