To pass wet hands over Khuffain [two leather socks covering the ankles]

Narrated `Abdullah bin `Umar: Sa`d bin Abi Waqqas said, "The Prophet (ﷺ) passed wet hands over his Khuffs (socks made from thick fabric or leather)." `Abdullah bin `Umar asked `Umar about it. `Umar replied in the affirmative and added, "Whenever Sa`d narrates a Hadith from the Prophet, there is no need to ask anyone else about it."