Musnad Abu Ya'la al-Mawsili 150:191

Abu Kurayb narrated to us, Khalid ibn Hayyan narrated to us, from Salim ibn Abdullah Abu al-Muhajir, from Maymun ibn Mihran, from Abu Hurayrah and Aisha: That the Prophet (peace and blessings of Allah be upon him) performed ablution three times, three times.