From Sahih Muslim (Hadith 2848):
Ibn 'Abbas (Allah be pleased with them) reported that al-Sa'b b. Jaththama presented to the Messenger of Allah (ﷺ) 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
Reference: Muslim 2848