The Book of Games and the Animals which May be Slaughtered and the Aninals that Are to be Eaten (Kitab-us-Said wa'l-Dhaba'ih wa ma Yu'kalu min Al-Hayawan)
Muslim :: Book 21 : Hadith 4771
Al-Bara' said: We found on the Day of Khaibar domestic asses, and the announcer of the Messenger of Allah (may peace be upon him) made an announcement that the earthen pots should be turned over.