Dua before salam — seeking refuge
اللّهُـمَّ إِنِّـي أَعـوذُ بِكَ مِـنْ عَذابِ...
اللّهُـمَّ إِنِّـي أَعـوذُ بِكَ مِـنْ عَذابِ القَـبْر، وَمِـنْ عَذابِ جَهَـنَّم، وَمِـنْ فِتْـنَةِ المَحْـيا وَالمَمـات، وَمِـنْ شَـرِّ فِتْـنَةِ المَسيحِ الدَّجّال
Allahumma innee aAAoothu bika min AAathabil-qabr, wamin AAathabi jahannam, wamin fitnatil-mahya walmamat, wamin shari fitnatil-maseehid-dajjal
Translation
O Allah, I take refuge in You from the punishment of the grave, from the torment of the Fire, from the trials and tribulations of life and death and from the evil affliction of Al-Maseeh Ad-Dajjal.
When to recite
Recited after the last tashahhud and before giving salam in prayer.
Source / Reference
Al-Bukhari 2/102, Muslim 1/412