Sunan Ibn Majah Book 1, Hadith 146

"I saw the Messenger of Allah during the campaign of Tabuk performing ablution, washing each part once."

Previous Hadith

"I saw the Messenger of Allah performing ablution, taking one handful (of water) at a time.'"

Sunan Ibn Majah Book 1, Hadith 145
Next Hadith

"I saw `Uthman and `Ali performing ablution, washing each part three times, and they said: 'This is how the Messenger of Allah used to perform ablution.'" (Hasan)

Another chain with similar wording.

Sunan Ibn Majah Book 1, Hadith 147