Sahih al-Bukhari, Hadith 203 ⓘ
Narrated Al-Mughira bin Shu`ba: Once Allah's Messenger went out to answer the call of nature and I followed him with a tumbler containing water, and when he finished, I poured water and he performed ablution and passed wet hands over his Khuffs (socks made from thick fabric or leather).
حَدَّثَنَا عَمْرُو بْنُ خَالِدٍ الْحَرَّانِيُّ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ سَعْدِ بْنِ إِبْرَاهِيمَ، عَنْ نَافِعِ بْنِ جُبَيْرٍ، عَنْ عُرْوَةَ بْنِ الْمُغِيرَةِ، عَنْ أَبِيهِ الْمُغِيرَةِ بْنِ شُعْبَةَ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم أَنَّهُ خَرَجَ لِحَاجَتِهِ فَاتَّبَعَهُ الْمُغِيرَةُ بِإِدَاوَةٍ فِيهَا مَاءٌ، فَصَبَّ عَلَيْهِ حِينَ فَرَغَ مِنْ حَاجَتِهِ، فَتَوَضَّأَ وَمَسَحَ عَلَى الْخُفَّيْنِ.
also referenced under: Book 4, Hadith 69 (In-Book) & Volume 1, Book 4, Hadith 202 (USC-MSA)