Ibn 'Umar reported that Allah's Messenger (ﷺ) forbade the eating of the (flesh) of domestic asses on the Day of Khaibar in spite of the fact that people needed that.
Sahih Muslim Book 34, Hadith 38
← Previous Hadith Ibn Umar reported that Allah's Messenger (way peace be upon him) forbade the eating of the flesh of domestic asses.

Sahih Muslim Book 34, Hadith 37 Next Hadith → I asked 'Abdullah b. Abu Aufa about (the lawfulness or unlawfulness of) the flesh of the domestic asses. He said: We experienced hunger on the Day of Khaibar as we were with the Messenger of Allah (ﷺ). We found domestic asses in the exterior of Medina. We slaughtered them and our earthen pots were boiling when the announcer of the Messenger of Allah (ﷺ) made an announcement that the earthen pots should be turned upside down and nothing of the flesh of the domestic asses should be eaten. I said: What kind of prohibition is it that he (the Holy Prophet) has made? He said: We discussed it amongst -ourselves. Some of us aaid that it has been declared unlawful for ever, (whereas others said) it has been declared unlawful since one-fifth (of the booty) has not been given (to the treasury, as is legally required).

Sahih Muslim Book 34, Hadith 39