Ablutions (Wudu')

Bukhari :: Book 1 :: Volume 4 :: Hadith 205

Narrated 'Urwa bin Al-Mughira:

My father said, "Once I was in the company of the Prophet on a journey and I dashed to take off his Khuffs. He ordered me to leave them as he had put them after performing ablution. So he passed wet hands or them.