It is narrated from Zirr bin Hubaysh that Sayyiduna Ali (may Allah be pleased with him) was asked about the ablution of the Messenger of Allah (peace and blessings be upon him). He poured water into a vessel, then asked: Where is the questioner who asked about the ablution of the Messenger of Allah (peace and blessings be upon him)? Then he washed his hands three times, his face three times and his forearms three times, and he wiped his head, so that water was almost dripping from it, and he washed his feet three times each. Then he said: This is how the Messenger of Allah (peace and blessings be upon him) used to perform ablution.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 352