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. (Using translation from Muslim 667)
أَنَّهُ سَمِعَ رَسُولَ اللهِ ﷺ يَقُولُ أَرَأَيْتُمْ لَوْ أَنَّ نَهْرًا بِبَابِ أَحَدِكُمْ يَغْتَسِلُ مِنْهُ كُلَّ يَوْمٍ خَمْسَ مَرَّاتٍ مَا تَقُولُونَ يَبْقَى مِنْ دَرَنِهِ؟ قَالُوا لَا يُبْقِي مِنْ دَرَنِهِ شَيْئًا قَالَ فَذَلِكَ مِثْلُ الصَّلَوَاتِ الْخَمْسِ يَمْحُو اللهُ بِهِنَّ الْخَطَايَا