Musnad Ahmad 1153:631

'Affan narrated to us, he said: Hammad—meaning Ibn Salamah—narrated to us, from 'Ata' ibn al-Sa'ib, from Abu Salamah ibn 'Abd al-Rahman, that 'Aisha said: "When the Messenger of Allah (peace and blessings of Allah be upon him) wanted to perform ghusl (ritual bath) for janabah (major ritual impurity), he would wash his hands three times. Then he would take with his right hand to pour onto his left, and he would wash his private part until he cleansed it. Then he would wash his hand thoroughly. Then he would rinse his mouth three times, and inhale water into his nose three times, and wash his face three times, and his forearms three times. Then he would pour water over his head three times, then he would wash his body. Then, when he stepped away, he would wash his feet."