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