It was narrated that Rubai' bint Mu'awwidh bin 'Afra' said:
"The Prophet performed ablution, and he put his fingers in the (holes) inside of his ears." (JA)
English reference (JA): Vol. 1, Book 1, Hadith 441 (JA)
Arabic reference (JA): Book 1, Hadith 476 (JA)