Musannaf Ibn Abi Shayba 16:101

Abu Bakr narrated to us, he said: Yazid bin Harun narrated to us, he said: Hisham bin Hassan narrated to us, from Muhammad bin Sirin, from Anas bin Malik, he said: When the day of Khaybar arrived, the people slaughtered donkeys and boiled the pots with them. The Messenger of Allah (peace and blessings of Allah be upon him) ordered Abu Talha, so he called out: "Indeed, Allah and His Messenger forbid you from the meat of domestic donkeys, for it is a filth." So the pots were overturned.