Abu Dawud Book 1, Hadith Number 115.

Chapter : A man who puts his hands in the utensil before washing it.

Narated By ‘Abd al-Rahman b. Abi Laila : I saw ‘Ali performing ablution. He washed his face three times and his hands three times and wiped his head once. Then he (‘Ali) said: The Apostle of Allah (PBUH) used to perform ablution in this way.