Sahih al-Bukhari 4421
Narrated `Urwa bin Al-Mughira:
Al-Mughira bin Shu`ba, said, "The Prophet (ﷺ) went out to answer the call of nature and (when he had 
finished) I got up to pour water for him." I think that he said that the event had taken place during the 
Ghazwa of Tabuk. Al-Mughira added. "The Prophet (ﷺ) washed his face, and when he wanted to wash his 
forearms, the sleeves of his cloak became tight over them, so he took them out from underneath the 
cloak and then he washed them (i.e. his forearms) and passed wet hands over his Khuffs (socks made 
from thick fabric or leather)."
حَدَّثَنَا يَحْيَى بْنُ بُكَيْرٍ، عَنِ اللَّيْثِ، عَنْ عَبْدِ الْعَزِيزِ بْنِ أَبِي سَلَمَةَ، عَنْ سَعْدِ بْنِ إِبْرَاهِيمَ، عَنْ نَافِعِ بْنِ جُبَيْرٍ، عَنْ عُرْوَةَ بْنِ الْمُغِيرَةِ، عَنْ أَبِيهِ الْمُغِيرَةِ بْنِ شُعْبَةَ، قَالَ ذَهَبَ النَّبِيُّ صلى الله عليه وسلم لِبَعْضِ حَاجَتِهِ، فَقُمْتُ أَسْكُبُ عَلَيْهِ الْمَاءَ ـ لاَ أَعْلَمُهُ إِلاَّ قَالَ فِي غَزْوَةِ تَبُوكَ ـ فَغَسَلَ وَجْهَهُ، وَذَهَبَ يَغْسِلُ ذِرَاعَيْهِ فَضَاقَ عَلَيْهِ كُمُّ الْجُبَّةِ، فَأَخْرَجَهُمَا مِنْ تَحْتِ جُبَّتِهِ فَغَسَلَهُمَا ثُمَّ مَسَحَ عَلَى خُفَّيْهِ‏.‏