Chapter 1: The Book of Purification
It was narrated from 'Amr bin Shu' aib, from his father, that his grandfather said: "A Bedouin came to the Prophet (ﷺ) to ask him about Wudu', so he showed him how to perform Wudu', washing each part three times, then he said: 'This is Wudu'. Whoever does more than that has done badly, done to extremes and done wrong.'"
Sunan an-Nasa'i 140