Beautiful Hadith is about Prayers

Narrated Abu Huraira RA: I heard Allah's Messenger (peace be upon him) 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 (peace be upon him) added, "That is the example of the five prayers with which Allah blots out (annuls) evil deeds." (Bukhari - Vol. 1, Book 10, Hadith 506)