Musnad Abu Ya'la al-Mawsili 150:183

Abu Kurayb narrated to us, Ibn Abi Za'idah narrated to us, from Harithah ibn Muhammad, from 'Amrah, from 'Aishah, who said: When the Messenger of Allah (peace and blessings of Allah be upon him) would stand for ablution, he would tilt the vessel, then mention the name of Allah, and then perform the ablution thoroughly.