It is narrated from Sayyiduna Usamah bin Zayd and Sayyiduna Abdullah bin Rawahah (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) and Bilal (may Allah be pleased with him) entered the house of Hamal. Then Bilal (may Allah be pleased with him) came out to the two of them and told them that the Messenger of Allah (peace and blessings be upon him) had performed ablution and wiped over the leather socks.
Hadith Referenceالمعجم الكبير للطبراني / باب الباء / 1060