We went to Khaibar with Messenger of Allah ﷺ. Then Allah granted (us) victory over them. On that very evening of the day when they had been granted victory, they lit many fires. Thereupon Messenger of Allah ﷺ said: What are those fires and what for those have been lit? They said: (These have been lit) for (cooking) the flesh. Thereupon he said: Of what flesh? They said: For the flesh of the domestic asses. Thereupon Messenger of Allah (may peace bo upon him) said: Throw that away and break them (the earthen pots in which the fiesa was being cooked). A person said: Messenger of Allah, should we throw it away and wash them (the cooking pots)? He said: You may do so.  

خَرَجْنَا مَعَ رَسُولِ اللَّهِ ﷺ إِلَى خَيْبَرَ ثُمَّ إِنَّ اللَّهَ فَتَحَهَا عَلَيْهِمْ فَلَمَّا أَمْسَى النَّاسُ الْيَوْمَ الَّذِي فُتِحَتْ عَلَيْهِمْ أَوْقَدُوا نِيرَانًا كَثِيرَةً فَقَالَ رَسُولُ اللَّهِ ﷺ مَا هَذِهِ النِّيرَانُ عَلَى أَىِّ شَىْءٍ تُوقِدُونَ قَالُوا عَلَى لَحْمٍ قَالَ عَلَى أَىِّ لَحْمٍ قَالُوا عَلَى لَحْمِ حُمُرٍ إِنْسِيَّةٍ فَقَالَ رَسُولُ اللَّهِ ﷺ أَهْرِيقُوهَا وَاكْسِرُوهَا فَقَالَ رَجُلٌ يَا رَسُولَ اللَّهِ أَوْ نُهَرِيقُهَا وَنَغْسِلُهَا قَالَ أَوْ ذَاكَ