The Messenger of Allah (peace and blessings be upon him) said: When Allah returns the soul to a servant (in the morning), and then he recites this supplication «لا اله الا الله وحده لا شريك له له الملك وله الحمد وهو على كل شىء قدير» , Allah forgives all his sins, even if they are as much as the foam of the sea.