(50) باب صِفَةِ وُضُوءِ النَّبِيِّ صلى الله عليه وسلم
Another version says:
He performed each part of the ablution three times and washed his feet times without number.
Reference: Sunan Abi Dawud 125
In-book reference: Book 1, Hadith 125
English translation: Book 1, Hadith 125