After the last tashahhud and before salam
O Allah, I seek refuge in You from the punishment of the grave, and from the punishment of Hell-fire...
اللّهُـمَّ إِنِّـي أَعـوذُ بِكَ مِـنْ عَذابِ القَـبْر وَمِـنْ عَذابِ جَهَـنَّم وَمِـنْ فِتْـنَةِ المَحْـيا وَالمَمـات …
"O Allah, I seek refuge in You from the punishment of the grave, and from the punishment of Hell-fire, and from the …"