Abu Dawud
Purification (Kitab Al-Taharah)
Book Number: 001 / Hadith Number: 133
Narated By Abdullah ibn Abbas : Sa'id ibn Jubayr reported: Ibn Abbas saw the Apostle of Allah (pbuh) performed ablution. He narrated the tradition which says that he (the Prophet) performed each detail of ablution three times. He wiped his head and ears once.