When the Prophet (ﷺ) uttered salutation at the end of the prayer, he used to say: "O Allah, forgive me my former and latter sins, what I have kept secret and what I have done openly, and what I have done extravagance; and what You know better than I do. You are the Advancer, the Delayer, there is no god but You."
Reference: Sunan Abi Dawud 1509 In-book : Book 8, Hadith 94 English translation : Book 8, Hadith 1504
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