Sayyiduna Mughirah bin Shu'bah (may Allah be pleased with him) says: One night I was with the Messenger of Allah (peace and blessings be upon him) when he (peace and blessings be upon him) dismounted and relieved himself. Then he came, and I poured water for him (peace and blessings be upon him) from a container that I had with me. He (peace and blessings be upon him) performed ablution and wiped over his leather socks.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 391