(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. (IT)
Reference (IT): Sunan Abi Dawud 125 (IT)
In-book reference (IT): Book 1, Hadith 125 (IT)
English translation (IT): Book 1, Hadith 125 (IT)