It was narrated that Farwah bin Nawfal said:

"I said to 'Aishah: 'Tell me of a supplication that the Messenger of Allah ﷺ used to say in his prayer.' She said: 'Yes. The Messenger of Allah ﷺ used to say: Allahumma inni author bika min sharri ma 'amiltu wa min sharri ma lam a'mal (O Allah, I seek refuge with You from the evil of that which I have done, and the evil of that which I have not done.)'"

أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنْ هِلاَلِ بْنِ يِسَافٍ، عَنْ فَرْوَةَ بْنِ نَوْفَلٍ، قَالَ قُلْتُ لِعَائِشَةَ حَدِّثِينِي بِشَىْءٍ، كَانَ رَسُولُ اللَّهِ ﷺ يَدْعُو بِهِ فِي صَلاَتِهِ . فَقَالَتْ نَعَمْ كَانَ رَسُولُ اللَّهِ ﷺ يَقُولُ " اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنْ شَرِّ مَا عَمِلْتُ وَمِنْ شَرِّ مَا لَمْ أَعْمَلْ " .