"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.'" (Using translation from Nasāʾī 69)  

أَتَانًا مُنَادِي رَسُولَ اللهِ ﷺ فَقَالَ إِنَّ «اللهَ وَرَسُولَهُ يَنْهَاكُمْ عَنِ لُحُومِ الْحَمِيرِ فَإِنَّهَا رِجْسٌ»