Supplications before ending the prayer
اَللّٰهُـمَّ اغْـفِرْلِيْ مَا قَدَّمْـتُ وَمَا أَخَّرْتُ، وَمَا أَسْـرَرْتُ وَمَا أَعْلَـنْتُ، وَمَا أَسْـرَفْتُ، وَمَا أَنْتَ أَعْـلَمُ بِهٖ مِنِّيْ۔ أَنْتَ الْمُقَـدِّمُ، وَأَنْتَ الْمُـؤَخِّـرُ لَآ إِلٰهَ إِلَّآ أَنْـتَ
O Allah, forgive me for those sins which have come to pass as well as those which shall come to pass, what I have concealed and what I have done openly, what I have done in excess, and what You are better aware of than I. You are the One Who sends forth and You are the One Who delays. There is none worthy of worship but You.
References
[Sahih Muslim - 771]
