"We were sitting with 'Abdullah bin 'Abbas and he said: 'By Allah, the Messenger of Allah (ﷺ) did not say specifically anything for us above the people, except for three things: He commanded us to do Wudu' properly, not to consume charity, and not to mate donkeys with horses.'"

Isbagh Al-Wudu' An Nusbig Al-Wudu'
Sunan an-Nasa'i Book 1, Hadith 142
← Previous Hadith "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 Book 1, Hadith 141 Next Hadith → "The Messenger of Allah (ﷺ) said: 'Do Wudu' properly.'"

Isbighu Al-Wudu'. And this narration supports the claim that some of them used this expression to mean "three times" for each limb, rather than "properly."

Sunan an-Nasa'i Book 1, Hadith 143