"I asked 'Aishah, what was the supplication that the Prophet (ﷺ) said the most? She said: 'The supplication that he said the most was: Allahumma, inni a'udhu bika min sharri ma 'amiltu wa min sharri ma lam a'mal ba'd (O Allah, I seek refuge with You from the evil of what I have done, and from the evil of what I have not done yet.)'"
Reference: Sunan an-Nasa'i 5524 In-book : Book 50, Hadith 97 English translation : Vol. 6, Book 50, Hadith 5526
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