Sunan At-Tirmidhi

Narrated Abu Hurairah:that the Messenger of Allah (ﷺ) said: ""Do you think that if there was a river by the gate of one of you, and he bathed in it five times each day that there would remain any filth on him?"" They said: ""No filth would stay on him."" He said: ""That is the parable of the five prayers, Allah wipes out the sins with them