Musnad Ahmad 626:57

Abu Mu'awiyah narrated to us, Al-A'mash narrated to us, from Muslim, from Masruq, from Al-Mughirah ibn Shu'bah, who said: I was with the Prophet, peace and blessings of Allah be upon him, on a journey. He said to me: "O Mughirah, take the water container." He said: So I took it. He said: Then I went with him, and he went until he was hidden from me, and he relieved himself. Then he came, and upon him was a Syrian jubbah (outer garment) with tight sleeves. He said: So he went to take his hands out of it, but they were too tight, so he took his hands out from under the jubbah. I poured [water] for him, and he performed his wudu (ablution) for prayer, then he wiped over his khuffayn (leather socks), then he prayed.