Narrated `Abdullah bin `Amr: Abu Bakr As-Siddiq said to the Prophet, Teach me an invocation with which I may invoke (Allah) in my prayer. The Prophet said, Say: Allahumma inni zalamtu nafsi zulman kathiran wala yaghfirudhdhunuba illa anta, Faghfirli maghfiratan min indika war-hamni, innaka antalGhafur-Rahim.