Musnad Ahmad

Abdu Khair, may Allah have mercy on him, says that once we came to Syedna Ali, may Allah be pleased with him, he had already performed the Fajr prayer, he asked for water for ablution, washed his hands three times, then rinsed his mouth three times with a single handful, washed his face three times, washed both arms including the elbows three times each, and said: Whoever wants to know the way of ablution of the Prophet, peace and blessings be upon him, then this is it.