Al-Mughira bin Shuʿba, 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)."  

ذَهَبَ النَّبِيُّ ﷺ لِبَعْضِ حَاجَتِهِ فَقُمْتُ أَسْكُبُ عَلَيْهِ الْمَاءَ لاَ أَعْلَمُهُ إِلاَّ قَالَ فِي غَزْوَةِ تَبُوكَ فَغَسَلَ وَجْهَهُ وَذَهَبَ يَغْسِلُ ذِرَاعَيْهِ فَضَاقَ عَلَيْهِ كُمُّ الْجُبَّةِ فَأَخْرَجَهُمَا مِنْ تَحْتِ جُبَّتِهِ فَغَسَلَهُمَا ثُمَّ مَسَحَ عَلَى خُفَّيْهِ  

"The Prophet ﷺ went out to relieve himself, and when he came back, I met him with a vessel (of water). I poured some for him and he washed his hands, then he washed his face. Then he wanted to wash his forearms but his Jubbah was too tight, so he brought them out from beneath the Jubbah to wash them, and he wiped over his Khuffs, then he led us in prayer."  

خَرَجَ النَّبِيُّ ﷺ لِحَاجَتِهِ فَلَمَّا رَجَعَ تَلَقَّيْتُهُ بِإِدَاوَةٍ فَصَبَبْتُ عَلَيْهِ فَغَسَلَ يَدَيْهِ ثُمَّ غَسَلَ وَجْهَهُ ثُمَّ ذَهَبَ لِيَغْسِلَ ذِرَاعَيْهِ فَضَاقَتْ بِهِ الْجُبَّةُ فَأَخْرَجَهُمَا مِنْ أَسْفَلِ الْجُبَّةِ فَغَسَلَهُمَا وَمَسَحَ عَلَى خُفَّيْهِ ثُمَّ صَلَّى بِنَا  

"The Prophet went out to relieve himself and when he came back, I met him with a water skin and poured water for him. He washed his hands and his face, then he went to wash his forearms but his garment was too tight, so he brought his arms out from underneath his garment and washed them, then he wiped over his leather socks, then he led us in prayer."  

خَرَجَ النَّبِيُّ ﷺ لِبَعْضِ حَاجَتِهِ فَلَمَّا رَجَعَ تَلَقَّيْتُهُ بِالإِدَاوَةِ فَصَبَبْتُ عَلَيْهِ فَغَسَلَ يَدَيْهِ ثُمَّ غَسَلَ وَجْهَهُ ثُمَّ ذَهَبَ يَغْسِلُ ذِرَاعَيْهِ فَضَاقَتِ الْجُبَّةُ فَأَخْرَجَهُمَا مِنْ تَحْتِ الْجُبَّةِ فَغَسَلَهُمَا وَمَسَحَ عَلَى خُفَّيْهِ ثُمَّ صَلَّى بِنَا  

[Machine] The Messenger of Allah ﷺ went to fulfill one of his needs, then he came back and I poured water on him and he washed his face. Then he went to wash his arms, but the sleeves of his garment were narrow, so he took them out from under the garment and washed them. Then he wiped over his feet.  

ذَهَبَ رَسُولُ اللهِ ﷺ لِبَعْضِ حَاجَتِهِ ثُمَّ جَاءَ فَسَكَبْتُ عَلَيْهِ الْمَاءَ فَغَسَلَ وَجْهَهُ ثُمَّ ذَهَبَ يَغْسِلُ ذِرَاعَيْهِ فَضَاقَ عَنْهُمَا كُمُّ الْجُبَّةِ فَأَخْرَجَهُمَا مِنْ تَحْتِ الْجُبَّةِ فَغَسَلَهُمَا ثُمَّ مَسَحَ عَلَى خُفَّيْهِ