The Messenger of Allah [SAW] used to say in his supplication: "Allahumma, inni a'udhu bika min 'adhabi jahannama, wa a'udhu bika min 'adhabil-qabri, wa a'udhu bika min fitnatil-masihid-dajjali, wa a'udhu bika min fitnatil-mahya wal-mamat (O Allah, I seek refuge with You from the torment of Hell, and I seek refuge in You from the torment of the grave, and I seek refuge in You from the tribulation of the Al-Masihid-Dajjal, and I seek refuge with You from the trials of life and death.)" (Using translation from Nasāʾī 5514)  

أَنَّ رَسُولَ اللهِ ﷺ كَانَ يَدْعُو يَقُولُ «اللهُمَّ إِنِّي أَعُوذُ بِكَ مِنْ عَذَابِ جَهَنَّمَ وَأَعُوذُ بِكَ مِنْ عَذَابِ الْقَبْرِ وَأَعُوذُ بِكَ مِنْ فِتْنَةِ الْمَسِيحِ الدَّجَّالِ وَأَعُوذُ بِكْ مِنْ فِتْنَةِ الْمَحْيَا وَالْمَمَاتِ»