Sahih Bukhari
Sahih Bukhari Volume 001, Book 004, Hadith Number 202.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 04. Ablutions (Wudu')
Narated By Al-Mughlra bin Shu'ba : Once Allah's Apostle went out to answer the call of nature and I followed him with a tumbler containing water, and when he finished, I poured water and he performed ablution and passed wet hands over his Khuffs.