(50) باب صِفَةِ وُضُوءِ النَّبِيِّ صلى الله عليه وسلم
Another version says:
He wiped his ears inside and outside. Hisham adds: He inserted his fingers in the ear-holes.
Reference: Sunan Abi Dawud 123
In-book reference: Book 1, Hadith 123
English translation: Book 1, Hadith 123