Ibn Abbas (may Allah be pleased with them both) narrates from Sayyiduna al-Sa'b bin Jaththamah (may Allah be pleased with him) that he gave the Messenger of Allah (peace and blessings be upon him) a wild donkey as a gift while he (peace and blessings be upon him) was at al-Abwa', or at Waddan. The Prophet (peace and blessings be upon him) returned it, and when the Messenger of Allah (peace and blessings be upon him) saw the expression on his face, he said: "We only returned it because we are in the state of ihram."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7399