416.Said the Prophet,(peace be upon him): 'The five set Prayers may be compared to a stream of fresh water, flowing in front of your house, into which you plunge five times each day. Do you think that would leave any dirt on your body?' When they replied: 'None at all!' The Prophet, on him be peace, said: 'Indeed the five Prayers remove sins, just as water removes dirt.'
(Muslim).
(Inner Dimensions of Islamic Worship. by Al-Ghazali). (Translated by Muhtar Holland).