Sunan at-Tirmidhi (Jami-al-Tirmidhi), Chapter: Taharah (Purification)

reported that he observed Sayyidina Ali (RA) perform ablution. He washed his both hands thoroughly, rinsed his mouth thrice, snuffed w up his nostrils thrice, washed his face thrice, washed both arms including elbows thrice, wiped head once and washed both feet including ankles. Then he stood up and drank the remaining water, saying, "I wished to show you how the Prophet (SAW) performed his ablution. [Abu Dawud 116, Nisai 70]