"Bring me (water for) Wudu'." So I brought him (water for) Wudu', and he performed Wudu' and wiped over his Khuffs. The Shaikh [1] said: "Isma'il (one of the narrators) is Ibn Ja'far bin Abi Kathir Al-Qari. [1] Meaning the author, and it appears that Ibn As-Sunni who heard the text, said this. (Using translation from Nasāʾī 17)   

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا ذَهَبَ الْمَذْهَبَ أَبَعْدَ قَالَ فَذَهَبَ لِحَاجَتِهِ وَهُوَ فِي بَعْضِ أَسْفَارِهِ فَقَالَ «ائْتِنِي بِوَضُوءٍ» فَأَتَيْتُهُ بِوَضُوءٍ «فَتَوَضَّأَ وَمَسَحَ عَلَى الْخُفَّيْنِ»  

"I went out with the Messenger of Allah ﷺ to an isolated area, and when he wanted to relieve himself he moved far away." (Using translation from Nasāʾī 16)  

«خَرَجْتُ مَعَ رَسُولِ اللهِ ﷺ إِلَى الْخَلَاءِ وَكَانَ إِذَا أَرَادَ الْحَاجَةَ أَبَعْدَ»