Musnad Abu Ya'la al-Mawsili 153:112

'Abd al-Ghaffar ibn 'Abd Allah narrated to us, 'Ali ibn Mushir narrated to us, from 'Ubayd Allah, from Nafi' from Ibn 'Umar, and Salim from Ibn 'Umar: That the Messenger of Allah (may Allah bless him and grant him peace) forbade the meat of domestic donkeys.