Musannaf Ibn Abi Shaybah 2056 — A man wading through rain mud

Yunus said: It was the habit of al-Hasan that on rainy days, when he was about to enter the mosque, he would look at his leather socks (khuffs). If a little mud was on them, he would wipe it off, then enter the mosque and pray; if there was a lot, he would take them off and order them to be washed.