It is narrated from Sayyiduna Abdullah bin Rawahah and Sayyiduna Usamah bin Zayd (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) and Sayyiduna Bilal (may Allah be pleased with him) entered the house of Hamal. Then Sayyiduna Bilal (may Allah be pleased with him) came out to the two of them (Abdullah bin Rawahah and Usamah) and informed them that the Messenger of Allah (peace and blessings be upon him) had performed ablution (wudu) and wiped over his leather socks.
Hadith Referenceالمعجم الكبير للطبراني / باب الألف / 424