Volume 5 · Book 59 · Hadith 527
Narrated 'Ali bin Abi Talib: On the day of Khaibar, Allah's Apostle forbade the Mut'a (i.e. temporary marriage) and the eating of donkey-meat.
— Sahih Bukhari, Volume 5, Book 59: Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi), Hadith #527