Sahih Muslim 274c
Sahih Muslim · Book 2: The Book of Purification · Wiping over the khuff (leather socks)
Mughira b. Shu'ba reported:
وَ حَدَّثَنَا 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 .
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.