Compiled by Imam Yahya ibn Sharaf al-Nawawi
وعن عثمان بن عفان رضي الله عنه قال: قال رسول الله صلى الله عليه وسلم: "من توضأ فأحسن الوضوء، خرجت خطاياه من جسده حتى تخرج من تحت أظفاره" ((رواه مسلم)).
The Messenger of Allah (ﷺ) said, "He who performs the Wudu' perfectly (i.e., according to Sunnah), his sins will depart from his body, even from under his nails."[Muslim].