Sayyiduna Jarir bin Abdullah (may Allah be pleased with him) said: "We were with the Messenger of Allah (peace and blessings be upon him) during the Farewell Hajj. The Prophet (peace and blessings be upon him) went to relieve himself, then he performed ablution and wiped over his leather socks."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2493