Narrated Anas bin Malik (rad):

On the day of Khaibair, Allah’s Messenger (ﷺ) commanded Abu Talha to announce: “Allah and His Messenger have prohibited for you (eating of) the flesh of the donkeys, for it is unclean”. [Agreed upon].

وَعَنْهُ قَالَ: { لَمَّا كَانَ يَوْمُ خَيْبَرَ, أَمَرَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-أَبَا طَلْحَةَ, فَنَادَى:

إِنَّ اَللَّهَ وَرَسُولَهُ يَنْهَيَانِكُمْ عَنْ لُحُومِ اَلْحُمُرِ]اَلْأَهْلِيَّةِ], فَإِنَّهَا رِجْسٌ

} مُتَّفَقٌ عَلَيْه ِ [1]‏ .‏