It is narrated from Sayyiduna al-Sa'b bin Jaththamah (may Allah be pleased with him) that he presented the Messenger of Allah (peace and blessings be upon him) with a wild donkey as a gift, and he (peace and blessings be upon him) returned it to him. When he (peace and blessings be upon him) saw on his face the displeasure at having his gift returned, he said: "Listen, 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 / 7402