Isma'il bin Muhammad bin Sa'd إسماعيل بن محمد بن سعد بن أبي وقاص الزهر · The Book of Purification

"I was with the Prophet (ﷺ) on a journey, and he said: 'Stay back O Mughirah! Go ahead, O people!' So I went back, and I had with me a vessel of water. The people went ahead, and there the Messenger of Allah (ﷺ) relieved himself. when he came back I went and poured water for him. He was wearing a Roman Jubbah with narrow sleeves, and he wanted to expose his hands (to wash them) but the sleeves were…