It was narrated from Miqdam bin Ma’dikarib Al-Kindi that the Messenger of Allah (ﷺ) forbade several things, until he mentioned (the meat of) domesticated donkeys.
Sunan Ibn Majah Book 27, Hadith 32
← Previous Hadith “I asked ‘Abdullah bin Abu Awfa about the flesh of domesticated donkeys and he said: ‘We were starving on the Day of Khaibar, when we were with the Prophet (ﷺ). The people had gotten some donkeys as spoils of war on the way out from Al-Madinah, so we slaughtered them and our cooking pots were boiling when the caller of the Messenger of Allah (ﷺ) cried out, telling us to overturn out pots and not to eat anything of the flesh of donkeys. So we overturned them.’ I said to ‘Abdullah bin Abu Awfa: ‘Was it made unlawful?’ He said: ‘We think that the Messenger of Allah (ﷺ) forbade it altogether because it eats excrement.’”

Sunan Ibn Majah Book 27, Hadith 31 Next Hadith → “The Messenger of Allah (ﷺ) commanded us to throw away the meat of domesticated donkeys, raw or cooked, then he did not say anything to us about it after that.”

Sunan Ibn Majah Book 27, Hadith 33