Wiping over the khuff (leather socks)
وَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى التَّمِيمِيُّ، أَخْبَرَنَا أَبُو الأَحْوَصِ، عَنْ أَشْعَثَ، عَنِ الأَسْوَدِ بْنِ هِلاَلٍ، عَنِ الْمُغِيرَةِ بْنِ شُعْبَةَ، قَالَ بَيْنَا أَنَا مَعَ، رَسُولِ اللَّهِ صلى الله عليه وسلم ذَاتَ لَيْلَةٍ إِذْ نَزَلَ فَقَضَى حَاجَتَهُ ثُمَّ جَاءَ فَصَبَبْتُ عَلَيْهِ مِنْ إِدَاوَةٍ كَانَتْ مَعِي فَتَوَضَّأَ وَمَسَحَ عَلَى خُفَّيْهِ .
Mughira b. Shu'ba reported: I was with the Messenger of Allah (ﷺ) one night. He came down (from the ride) and relieved himself. He then came and I poured water upon him from the jar that I carried with me. He performed ablution and wiped over his socks.