Maliks Muwatta Book 28, Hadith Number 41.

Yahya related to me from Malik from Ibn Shihab from Abdullah and Hasan, the sons of Muhammad ibn Ali ibn Abi Talib from their father, may Allah be pleased with him, that the Messenger of Allah, may Allah bless him and grant him peace, forbade temporary marriage with women and the flesh of domestic donkeys on the Day of Khaybar.