Characteristics of Prayer
Bukhari :: Book 1 :: Volume 12 :: Hadith 796
Narrated Abu Bakr As-Siddiq:
I asked Allah's Apostle to teach me an invocation so that I may invoke Allah with it in my prayer. He told me to say, "Allahumma inni zalumtu nafsi zulman kathiran, Wala yaghfirudhdhunuba illa anta faghfirli maghfiratan min 'Indika, war-hamni innaka antal-ghafururrahim (O Allah! I have done great injustice to myself and none except You forgives sins, so please forgive me and be Merciful to me as You are the Forgiver, the Merciful)."
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