question #3 Sahih Muslim 667, Book 5, Hadith 355 : What is the significance of comparing daily prayers to washing in a river in terms of removing impurities?

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.