اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنْ عَذَابِ الْقَبْرِ، وَمِنْ عَذَابِ جَهَنَّمَ، وَمِنْ فِتْنَةِ الْمَحْيَا وَالْمَمَاتِ، وَمِنْ شَرِّ فِتْنَةِ الْمَسِيحِ الدَّجَّالِ
Transliteration
Allahumma inni a'udhu bika min 'adhabil-qabri, wa min 'adhabi jahannama, wa min fitnatil-mahya wal-mamati, wa min sharri fitnatil-masihid-dajjal
English meaning
O Allah, I seek refuge in You from the punishment of the grave, from the punishment of the Hellfire, from the trials of life and death, and from the evil of the trial of the False Messiah.
When is it recited?
Recited in the final sitting, just before giving the salam.
Its virtue
The Prophet (PBUH) taught this supplication for every prayer.
Source
Bukhari, Jana'iz 87, 1377; Muslim, Masajid 128, 588