Sayyiduna Sa'b bin Jaththamah (may Allah be pleased with him) said: I gave the Messenger of Allah (peace and blessings be upon him) the leg of a wild donkey as a gift while he (peace and blessings be upon him) was at Waddan, and he (peace and blessings be upon him) returned it to me. When he (peace and blessings be upon him) saw the state of my face, he said: "We returned it to you only because we are in the state of ihram."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7411