´It was narrated that Shaqiq bin Salamah said:` "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.
Hadith ReferenceSunan Ibn Majah / The Book of Purification and its Sunnah / Hadith: 413
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:إسناده حسن