Ablutions (Wudu')

Bukhari :: Book 1 :: Volume 4 :: Hadith 154

Narrated Anas bin Malik:

Whenever Allah's Apostle went to answer the call of nature, I along with another boy used to carry a tumbler full of water (for cleaning the private parts) and an 'Anza (spear-headed stuck).

Source materials are from the University of Southern California MSA site
Hadith eBooks converted from Imaan Star