It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The example of the five prayers is like a river of sweet water flowing at the door of one of you, in which he bathes five times every day; so what dirt would remain on him?"
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7653