Sunan Ibn Majah 546
It was narrated from Ibn 'Umar that:
He saw Sa'd 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 regarding wiping over leather socks." 'Umar said: "We used to wipe over our leather socks when we were with the Messenger of Allah and we do not see anything wrong with that." Ibn 'Umar said: "Even if that is after one has defecated?" He said: "Yes."
حَدَّثَنَا عِمْرَانُ بْنُ مُوسَى اللَّيْثِيُّ، حَدَّثَنَا مُحَمَّدُ بْنُ سَوَاءٍ، حَدَّثَنَا سَعِيدُ بْنُ أَبِي عَرُوبَةَ، عَنْ أَيُّوبَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّهُ رَأَى سَعْدَ بْنَ مَالِكٍ وَهُوَ يَمْسَحُ عَلَى الْخُفَّيْنِ فَقَالَ إِنَّكُمْ لَتَفْعَلُونَ ذَلِكَ فَاجْتَمَعْنَا عِنْدَ عُمَرَ فَقَالَ سَعْدٌ لِعُمَرَ أَفْتِ ابْنَ أَخِي فِي الْمَسْحِ عَلَى الْخُفَّيْنِ ‏.‏ فَقَالَ عُمَرُ كُنَّا وَنَحْنُ مَعَ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ نَمْسَحُ عَلَى خِفَافِنَا لَمْ نَرَ بِذَلِكَ بَأْسًا ‏.‏ فَقَالَ ابْنُ عُمَرَ وَإِنْ جَاءَ مِنَ الْغَائِطِ قَالَ نَعَمْ ‏.‏