Narrated `Abdullah bin `Amr: Abu Bakr As-Siddiq said to the Prophet O Allah's Apostle! Teach me an invocation with which I may invoke Allah in my prayers. The Prophet said, Say: O Allah! I have wronged my soul very much (oppressed myself), and none forgives the sins but You; so please bestow Your Forgiveness upon me. No doubt, You are the Oft-Forgiving, Most Merciful.