I saw the Messenger of Allah ﷺ perform ablution, washing each part twice.
حدثنا زيد بن الحباب حدثنا ابن ثوبان قال حدثني عبد الله بن الفضل عن الأعرج
رأيت رسول الله ﷺ يتوضأ مرتين مرتين
No references are available.
Suyuti reported it in Jami Saghir with the wording, "He would perform wudu once each, twice each, and three times each, doing all of that." Tabarani narrated it from Muaz, and it is a hasan hadith.