(5) باب تَحْرِيمِ أَكْلِ لَحْمِ الْحُمُرِ الإِنْسِيَّةِ
Salama b. Akwa' reported:
We went to Khaibar with Allah's Messenger (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 Allah's Messenger (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 Allah's Messenger (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.
Reference: Sahih Muslim 1802 c
In-book reference: Book 34, Hadith 47
USC-MSA web (English) reference(deprecated numbering scheme): Book 21, Hadith 4775