"I said to 'Aishah: 'Tell me of a supplication that the Messenger of Allah (ﷺ) used to say.' She said: 'He used to say: Allahumma, inni a'udhu bika min sharri ma 'amiltu wa min sharri ma lam a'mal ba'd (O Allah, I seek refuge in You from the evil of what I have done and from the evil of what I have not done.)'"
Reference: Sunan an-Nasa'i 5528 In-book : Book 50, Hadith 101 English translation : Vol. 6, Book 50, Hadith 5530
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