I was in the company of Allah's Messenger (ﷺ) 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 (socks made from thick fabric or leather).
Reference: Sahih al-Bukhari 182 In-book : Book 4, Hadith 48 USC-MSA web (English) : Vol. 1, Book 4, Hadith 182 (deprecated)
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