Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)

Bukhari :: Book 5 :: Volume 59 :: Hadith 535

Narrated Al-Bara Bin Azib:

During the Ghazwa of Khaibar, the Prophet ordered us to throw away the meat of the donkeys whether it was still raw or cooked. He did not allow us to eat it later on.