Safwan bin 'Assal · The Book of Purification

"The Prophet (ﷺ) granted us a dispensation when traveling, allowing us not to take off our Khuffs for three days and three nights."

"I asked Safwan bin 'Assal about wiping over the Khuffs, and he said: 'The Messenger of Allah (ﷺ) used to tell us, when we were travelling, to wipe over our Khuffs and not take them off for three nights in the event of defecating, urinating or sleeping; only in the case of Janabah.'"