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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."