Mukhtasar Bukhari (Abridged) 330 — Five daily prayers expiate sins

Narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that he heard the Messenger of Allah, peace and blessings be upon him, say: "If there was a river at the door of any one of you in which he bathed five times a day, do you think that any dirt would remain on him?" The Companions, may Allah be pleased with them, replied: "Nothing of his dirt would remain." So the Prophet, peace and blessings be upon him, said: "This is the example of the five prayers; Allah wipes out sins through them."