Musannaf Ibn Abi Shayba 1:1871

Ibn ‘Uyaynah narrated to us, from Isma‘il ibn Muhammad, from Hamzah ibn al-Mughirah, from his father, that the Messenger of Allah (may Allah bless him and grant him peace) relieved himself, then came and performed ablution (wudu) and wiped over his leather socks (khuffayn).