Maliks Muwatta Book 20, Hadith Number 84.
Section : Game that is Not Halal to Eat in Ihram.
Yahya related to me from Malik, from Ibn Shihab, from Ubaydullah ibn Abdullah ibn Utba ibn Masud, from Abdullah ibn Abbas, that as-Sab ibn Jaththama al-Laythi once gave a wild ass to the Messenger of Allah, may Allah bless him and grant him peace, while he was at al-Abwa, or Waddan, and the Messenger of Allah, may Allah bless him and grant him peace, gave it back to him. However, when the Messenger of Allah, may Allah bless him and grant him peace, saw the expression on the man’s face he said, “We only gave it back to you because we are in ihram.”