What supplication did the Messenger of Allah [SAW] say the most before he died? 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.)'" (Using translation from Nasāʾī 5523)
أَنَّهُ سَأَلَ عَائِشَةَ زَوْجَ النَّبِيِّ ﷺ مَا كَانَ أَكْثَرَ مَا كَانَ يَدْعُو بِهِ رَسُولُ اللهِ ﷺ قَبْلَ مَوْتِهِ؟ قَالَتْ كَانَ أَكْثَرَ مَا كَانَ يَدْعُو بِهِ «اللهُمَّ إِنِّي أَعُوذُ بِكَ مِنْ شَرِّ مَا عَمِلْتُ وَمِنْ سَوْءِ مَا لَمْ أَعْمَلْ»