The Messenger of Allah [SAW] used to say: "Allahumma inni a'udhu bika min 'adhabil-qabri, wa a'udhu bika min 'adhabin-nari, wa a'udhu bika min fitnatil-mahya wal-mamat wa a'udhu bika min sharril-masihid-dajjali (O Allah, I seek refuge with You from the torment of the grave, and I seek refuge with You from the torment of the Fire, and I seek refuge with You from the trials of life and death, and I seek refuge with You from the evil of the Al-Masihid-Dajjal.)"
عَنْ رَسُولِ اللَّهِ ﷺ أَنَّهُ كَانَ يَقُولُ اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنْ عَذَابِ الْقَبْرِ وَأَعُوذُ بِكَ مِنْ عَذَابِ النَّارِ وَأَعُوذُ بِكَ مِنْ فِتْنَةِ الْمَحْيَا وَالْمَمَاتِ وَأَعُوذُ بِكَ مِنْ شَرِّ الْمَسِيحِ الدَّجَّالِ