Musannaf Ibn Abi Shayba 16:98

Abu Bakr narrated to us, he said: Abu al-Ahwas narrated to us, from Abu Ishaq, from al-Bara’, who said: The people were afflicted with severe hunger on the day of Khaybar, so they obtained domestic donkeys and cooked some of them. Then the Messenger of Allah, may Allah bless him and grant him peace, ordered the cooking pots, and they were overturned.