Sahih Muslim
The Book of Games and the Animals which May be Slaughtered and the Aninals that Are to be Eaten (Kitab-us-Said wal-Dhabaih wa ma Yukalu min Al-Hayawan)
Book Number: 021 / Hadith Number: 4770
'Adi (he was the son of Thabit) said: I heard al-Bara' and 'Abdullah b. Abu Aufa say: We found domestic asses and we cooked them. Then the announcer of Allah's Messenger (may peace be upon him) made an announcement that the earthen pots should be turned over.