“اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنْ عَذَابِ الْقَبْرِ، وَمِنْ عَذَابِ جَهَنَّمَ، وَمِنْ فِتْنَةِ الْمَحْيَا وَالْمَمَاتِ، وَمِنْ شَرِّ فِتْنَةِ الْمَسِيحِ الدَّجَّالِ”.

Allaahumma ‘innee ‘a’oothu bika min l’athaabil-qabri, wa min ‘athaabi jahannama, wa min fitnatil-mahyaa walmamaati, wa min sharri fitnatil-maseehid-dajjaal.

O Allah, I seek refuge in You from the punishment of the grave, and from the punishment of Hell-fire, and from the trials of life and death, and from the evil of the trial of the False Messiah.

Reference: Al-Bukhari 2/102, Muslim 1/412, and this is Muslim’s wording.