Musannaf Ibn Abi Shaybah 1890 — Wiping over the leather socks

Salim bin Abdullah said: Sayyiduna Sa'd bin Abi Waqqas asked Sayyiduna Umar bin al-Khattab (may Allah be pleased with them both) about wiping over the leather socks, and Sayyiduna Umar said: "The Prophet (peace and blessings be upon him) used to command wiping over the leather socks, provided they had been put on in a state of purity."