389. Narrated Aboo Huraira (radhi Allaahu anhu) : I heard Allaah’s Messenger (Sallallaahu Alaihi Wasallam) saying,
“If there was a river at the door of anyone of you and he took a bath in it five times a day, would you notice any dirt on him?” They said, “Not a trace of dirt would be left.” The Prophet (Sallallaahu Alaihi Wasallam) added, “That is the example of the five Salaat (prayers) with which Allaah blots our (annuls) evil deeds.”
[Saheeh Al-Bukhaari, Hadeeth No. 506, Vol. 1]
Source :The Book of Mosques and places of worship – Chapter 51 – Going (to the mosque) for As-Salaat (the prayer) blots out (annuls) evil deeds and raises the reward in degrees. Al-Lulu Wal-Marjan, Compiled by : Fuwad Abdul-Baqi, Translated by : Dr. Muhammad Muhsin Khan