Sunan Ibn Majah, Chapter: The Chapters of Purification and its Sunnah

that he saw Sad bin Malik wiping over his leather socks and said: "Is it you doing this?" They both went to 'Umar and Sa'd said to 'Umar: "Give my brother's son a verdict wiping over leather socks." 'Umar said: "We used to wipe over our leather socks when we were with the Messenger of Allah (saw) and we do not see anything wrong with that." Ibn Umar said: "Even if that is after one has defecated?" He said: "Yes." (Sahih)