ar-Rubbayi' bint Mu'awwidh bin 'Afra' · The Book on Purification

"The Prophet wiped his head two times: He began with the rear of his head, then with the front of his head and with both of his ears, outside and Inside of them."

she saw the Prophet performing Wudu. She said: "He wiped his head, and what is in the front of it and what is in its rear, and his temples and his ears one time."