Sunan an-Nasa'i, 17

It was narrated from Al-Mughirah bin Shu'bah that when the Prophet (ﷺ) would go away (to relieve himself) he would go far away. He went to relieve himself when he was on one of his journeys, and said:"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

Rapporté par Al-Mughirah bin Shu'bah : Quand le Prophète (ﷺ) allait se soulager, il s’éloignait. Il est allé se soulager pendant un de ses voyages et a dit : "Apportez-moi de l’eau pour les ablutions." Je lui ai apporté de l’eau pour ses ablutions, il a fait ses ablutions et a passé ses mains mouillées sur ses khuffs