Musannaf Ibn Abi Shaybah 39659 — The Battle of Khaybar

It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that on the day of Khaybar the people slaughtered donkeys, and they had been put in the pots and were being brought to the boil, when the Messenger of Allah (peace and blessings be upon him) ordered Sayyiduna Abu Talhah (may Allah be pleased with him), and he made this proclamation: "Indeed Allah and His Messenger have forbidden you the meat of domestic donkeys, for they are impure." So (on hearing this) the pots were overturned.