From Sahih Muslim (Hadith 1522):
In the hadith narrated of the authority of Abd Huraira the Messenger of Allah (ﷺ) is reported to have said. while in the hadith narrated by Bakr (the words are like this):He heard the Messenger of Allah (ﷺ) as saying: just see, can anything of his filthiness remain (on the body of) any one of you if there were a river at his door in which he washed himself five times daily? They, said: Nothing of his filthiness will remain (on his body). He said: That is like the five prayers by which Allah obliterates sins
Reference: Muslim 1522