From Sahih Bukhari (Hadith 4222):
Narrated Al-Bara and `Abdullah bin Abi `Aufa:That when they were in the company of the Prophet, they got some donkeys which they (slaughtered and) cooked. Then the announcer of the Prophet (ﷺ) said, "Turn the cooking pots upside down (i.e. throw out the meat)
Reference: Bukhari 4222