The Book of Pilgrimage (Kitab Al-Hajj)
Muslim :: Book 7 : Hadith 2704
Ibn 'Abbas (Allah be pleased with them) reported that al-Sa'b b. Jaththama presented to the Apostle of Allah (may peace be upon him) a wild ass as he was in a state of Ihram, and he returned it to him saying: If we were not in a state of Ihram, we would have accepted it from you.