It was narrated from Ibn 'Umar that he said: I saw Sa'd bin Abi Waqqas wiping over his khuffain in Iraq when he did wudoo’ and I objected to that When we met with 'Umar bin al-Khattab, he said to me. Ask your father about what you objected to me doing of wiping over my khuffain, I mentioned that to him and he said: If Sa'd tells you something, do not object to it, for the Messenger of Allah (ﷺ) used to wipe over his khuffain.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا ابْنُ لَهِيعَةَ، عَنْ أَبِي النَّضْرِ، عَنْ أَبِي سَلَمَةَ، عَنِ ابْنِ عُمَرَ، رَضِيَ اللَّهُ عَنْهُ أَنَّهُ قَالَ رَأَيْتُ سَعْدَ بْنَ أَبِي وَقَّاصٍ يَمْسَحُ عَلَى خُفَّيْهِ بِالْعِرَاقِ حِينَ يَتَوَضَّأُ فَأَنْكَرْتُ ذَلِكَ عَلَيْهِ قَالَ فَلَمَّا اجْتَمَعْنَا عِنْدَ عُمَرَ بْنِ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُ قَالَ لِي سَلْ أَبَاكَ عَمَّا أَنْكَرْتَ عَلَيَّ مِنْ مَسْحِ الْخُفَّيْنِ قَالَ فَذَكَرْتُ ذَلِكَ لَهُ فَقَالَ إِذَا حَدَّثَكَ سَعْدٌ بِشَيْءٍ فَلَا تَرُدَّ عَلَيْهِ فَإِنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ يَمْسَحُ عَلَى الْخُفَّيْنِ.
sunnah.com