Sayyiduna al-Sa'b bin Jaththamah (may Allah be pleased with him) said: I presented the Messenger of Allah (peace and blessings be upon him) with a wild donkey as a gift at al-Abwa', and he (peace and blessings be upon him) returned it to me. When the Messenger of Allah (peace and blessings be upon him) recognised on my face my displeasure at its being returned, he said: "We have not returned it to you out of disregard for you; rather, we are in the state of ihram."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7408