Volume 1, Book 4, Number 182:
Narrated Al-Mughira bin Shu’ba:
I was in the company of Allah’s Apostle on one of the journeys and he went out to answer the call
of nature (and after he finished) I poured water and he performed ablution; he washed his face,
forearms and passed his wet hand over his head and over the two Khuff, (leather socks).