Bishr bin Quhayf (may Allah have mercy on him) narrates: We were in the house of al-Mughirah bin Shu'bah (may Allah be pleased with him) when the people began discussing purification, and he said: "I saw the Messenger of Allah (peace and blessings be upon him) relieve himself, then he (peace and blessings be upon him) performed ablution and wiped over his leather socks."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 18109