Yahya related to me from Malik from Hisham ibn Urwa from hisfather from A'isha, umm al-muminin, that whenever the Messenger ofAllah, may Allah bless him and grant him peace, did ghusl for majorritual impurity, he would begin by washing his hands, and then do wuduas for prayer. He would then put his fingers in the water and rub theroots of his hair with them. Then he would pour as much water as twohands can hold on to his head three times, and over the entire surfaceof his skin.
USC-MSA web (English) reference: Book 2, Hadith 69
Arabic reference: Book 2, Hadith 99