Hammam bin Al-Harith said, "I saw Jarir bin ʿAbdullah urinating. Then he performed ablution and passed his (wet) hands over his Khuffs (socks made from thick fabric or leather), stood up and prayed. He was asked about it. He replied that he had seen the Prophet ﷺ doing the same." They approved of this narration as Jarir was one of those who embraced Islam very late.  

رَأَيْتُ جَرِيرَ بْنَ عَبْدِ اللَّهِ بَالَ ثُمَّ تَوَضَّأَ وَمَسَحَ عَلَى خُفَّيْهِ ثُمَّ قَامَ فَصَلَّى فَسُئِلَ فَقَالَ رَأَيْتُ النَّبِيَّ ﷺ صَنَعَ مِثْلَ هَذَا  

I helped the Prophet ﷺ in performing ablution and he passed his wet hands over his Khuffs and prayed.  

وَضَّأْتُ النَّبِيَّ ﷺ فَمَسَحَ عَلَى خُفَّيْهِ وَصَلَّى