"Messenger of Allah came to a waste area used by people, so he urinated on it while standing. I brought him the (water for) Wudu. Then I left to be away from him, but he called me until I was behind him. So he performed Wudu and wiped (Masaba) over his Khuff."  

أَنَّ النَّبِيَّ ﷺ أَتَى سُبَاطَةَ قَوْمٍ فَبَالَ عَلَيْهَا قَائِمًا فَأَتَيْتُهُ بِوَضُوءٍ فَذَهَبْتُ لأَتَأَخَّرَ عَنْهُ فَدَعَانِي حَتَّى كُنْتُ عِنْدَ عَقِبَيْهِ فَتَوَضَّأَ وَمَسَحَ عَلَى خُفَّيْهِ