Hazrat Rabi’ bin Hirash narrates that Hazrat Ali (may Allah be pleased with him) said: There are no words more beloved to Allah than these words, that a servant says: O Allah! There is no deity worthy of worship except You. O Allah! I worship no one except You. O Allah! I do not associate anything with You. O Allah! Indeed, I have wronged myself, so forgive my sins, for surely no one can forgive sins except You.