Zirr bin Hubaish narrates: I presented myself before Sayyiduna Safwan bin Assal Muradi. I said: I have some confusion in my mind regarding wiping over the leather socks (khuffs); did you hear the Prophet Muhammad (peace be upon him) say anything about wiping over the leather socks? He replied: Yes! The Messenger of Allah commanded us that when we are in a state of travel (the narrator says, perhaps these are the words) when we are travelers, after defecating or urinating (while performing ablution), we should not remove our leather socks for three days and three nights (the narrator is unsure, perhaps these are the words) do not take them off, except in the case of major ritual impurity (janabah), for which the ruling is different.