Abu Hurairahu (May Allah be pleased with him) reported:
I heard the Messenger of Allah (PBUH) saying,
“Say, if there were a river at the door of one of you in which he takes a bath five times a day, would any soiling remain on him?”
They replied, “No soiling would left on him.”
He (PBUH) said, ” That is the five (obligatory) Salat (prayers). Allah obliterates all sins as a result of performing them.”
[Al-Bukhari and Muslim].