Musnad Abu Ya'la al-Mawsili 151:60

Muhammad ibn Abi Bakr al-Muqaddami narrated to us, Sulayman Abu Dawud narrated to us, Yazid ibn 'Ata narrated to us, from Abu Ishaq, from Abu 'Ubaydah, from 'Abdullah, who said: The Messenger of Allah, may Allah bless him and grant him peace, had a donkey that was called 'Ufayr.