It wasnarrated that Abu Ishaq Shaibani said:
"I asked 'Abdullah binAbuAwfa about the flesh of domesticated donkeys and he said: 'We werestarving 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 outfrom Al-Madinah, so we slaughtered them and our cooking pots wereboiling when the caller of the Messenger of Allah (ﷺ) cried out,telling us to overturn out pots and not to eat anything of the fleshof donkeys. So we overturned them.' I said to 'Abdullah bin AbuAwfa:'Was it made unlawful?' He said: 'We think that theMessenger of Allah(ﷺ) forbade it altogether because it eatsexcrement.'"
English reference: Vol. 4, Book 27, Hadith 3192
Arabic reference: Book 27, Hadith 3313