Musannaf Ibn Abi Shaybah 1885 — Wiping over the leather socks

Zirr said: I came to Sayyiduna Safwan bin Assal al-Muradi (may Allah be pleased with him). He asked: "What has brought you?" I said: "Seeking knowledge." He said: "The angels spread their wings beneath the feet of the seeker of knowledge." Then he said: "When we were on a journey, the Messenger of Allah (peace and blessings be upon him) would command us not to take off our leather socks for three days, except in a state of major ritual impurity (janabah), even if we had relieved ourselves, urinated or slept."