Ibn Abbas (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) performed ablution, put his hand into the vessel, rinsed his nose and mouth once, then put his hand in again and washed his face once, and washed his hands once, and wiped his head and ears once.
Hadith Referenceمسند الإمام الشافعي / كتاب الطهارة / 47
Hadith Takhrijأخرجه البخاري: الوضوء، باب الوضوء مرة مرة: (157).