On the day of Khaibar the Prophet ﷺ saw fires being lighted. He asked, "Why are these fires being lighted?" The people replied that they were cooking the meat of donkeys. He said, "Break the pots and throw away their contents." The people said, "Shall we throw away their contents and wash the pots (rather than break them)?" He said, "Wash them."
أَنَّ النَّبِيَّ ﷺ رَأَى نِيرَانًا تُوقَدُ يَوْمَ خَيْبَرَ قَالَ عَلَى مَا تُوقَدُ هَذِهِ النِّيرَانُ قَالُوا عَلَى الْحُمُرِ الإِنْسِيَّةِ قَالَ اكْسِرُوهَا وَأَهْرِقُوهَا قَالُوا أَلاَ نُهْرِيقُهَا وَنَغْسِلُهَا قَالَ اغْسِلُوا قَالَ أَبُو عَبْد اللَّهِ كَانَ ابْنُ أَبِي أُوَيْسٍ يَقُولُ الْحُمُرِ الْأَنْسِيَّةِ بِنَصْبِ الْأَلِفِ وَالنُّونِ