"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.'"  

أَتَانَا مُنَادِي رَسُولِ اللَّهِ ﷺ فَقَالَ إِنَّ اللَّهَ وَرَسُولَهُ يَنْهَاكُمْ عَنْ لُحُومِ الْحُمُرِ فَإِنَّهَا رِجْسٌ