Supplications before ending the prayer
اَللّٰهُـمَّ إِنِّيْٓ أَعـوْذُ بِكَ مِـنْ عَذَابِ الْقَـبْرِ، وَأَعُـوْذُ بِكَ مِـنْ فِتْـنَةِ الْمَسِيْحِ الدَّجَّـالِ، وَأَعُـوْذُ بِكَ مِـنْ فِتْـنَةِ الْمَحْـيَا وَالمَمَـاتِ، اَللّٰهُـمَّ إِنِّيْٓ أَعُـوْذُ بِكَ مِنَ الْمَأْثَـمِ وَالْمَغْـرَمِ
O Allah, I seek refuge in You from the punishment of the grave, and I seek refuge in You from the trial of the False Messiah, and I seek refuge in You from the trials of life and death. O Allah, I seek refuge in You from sin and from debt.
References
[Sahih Muslim - 589]