When it was the Day of Khaibar a visitor came and said: Messenger of Allah, the asses have been eaten. Then another came and said: Messenger of Allah, the asses are being destroyed. Then Messenger of Allah ﷺ commanded Abu Talha to make an announcement that Allah and His Messenger have prohibited you (from eating) of the flesh of (domestic) asses, for these are loathsome or impure. He (the narrator) said: The earthein pots were turned over along with what was in them.

لَمَّا كَانَ يَوْمُ خَيْبَرَ جَاءَ جَاءٍ فَقَالَ يَا رَسُولَ اللَّهِ أُكِلَتِ الْحُمُرُ ثُمَّ جَاءَ آخَرُ فَقَالَ يَا رَسُولَ اللَّهِ أُفْنِيَتِ الْحُمُرُ فَأَمَرَ رَسُولُ اللَّهِ ﷺ أَبَا طَلْحَةَ فَنَادَى إِنَّ اللَّهَ وَرَسُولَهُ يَنْهَيَانِكُمْ عَنْ لُحُومِ الْحُمُرِ فَإِنَّهَا رِجْسٌ أَوْ نَجِسٌ قَالَ فَأُكْفِئَتِ الْقُدُورُ بِمَا فِيهَا

[Machine] The Messenger of Allah ﷺ commanded Abu Talha during the battle of Khaybar to announce that Allah and His Messenger prohibit you from consuming the meat of domestic donkeys, as it is impure. He then ordered the cooking pots to be overturned.

أَمَرَ رَسُولُ اللهِ ﷺ أَبَا طَلْحَةَ فِي غَزْوَةِ خَيْبَرَ يُنَادِي إِنَّ اللهَ وَرَسُولَهُ يَنْهَيَانِكُمْ عَنْ لُحُومِ الْحُمُرِ الْأَهْلِيَّةِ فَإِنَّهَا رِجْسٌ قَالَ فَأُكْفِئَتِ الْقُدُورُ