Humran (may Allah have mercy on him) narrates that Uthman (may Allah be pleased with him) performed ablution at his sitting place and washed each limb of ablution three times, then said: I heard the Messenger of Allah (peace and blessings be upon him) saying: “Whoever performs ablution like this of mine, his sins will depart from his face, hands, and feet.”
Hadith Referenceمسند الإمام الشافعي / كتاب الطهارة / 54
Hadith Takhrijأخرجه البخاري: الوضوء، باب الوضوء ثلاثاً ثلاثاً (159) (164) ومسلم، الطهارة، باب فضل الوضوء والصلاة عقبه (230) (226).