Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) says that the Messenger of Allah (peace and blessings be upon him) "on the day of Khaybar forbade the meat of domestic donkeys, and riding the jallalah and eating its meat."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19479