يَنْهَاكُمْ عَنْ لُحُومِ الْحُمُرِ فَإِنَّهَا رِجْسٌ .
It was narrated that Anas said: "An announcer came to us from the Messenger of Allah (ﷺ) and said: 'Allah and His Messenger forbid you from (eating) the flesh of domestic donkeys, for it is filth.'"