Ibn 'Abbas said, "The Prophet, may Allah bless him and grant him peace, used to teach us this supplication as he taught us the suras of the Qur'an: 'I seek refuge with You from the punishment of Hellfire, and I seek refuge with You from the punishment of the grave. I seek refuge with You from the trial of the Dajjal and the I seek refuge from the trials of life and death. I seek refuge with You from the trial of the grave.'"
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا إِبْرَاهِيمُ بْنُ الْمُنْذِرِ، قَالَ: حَدَّثَنَا بَكْرُ بْنُ سُلَيْمٍ الصَّوَّافُ قَالَ: حَدَّثَنِي حُمَيْدُ بْنُ زِيَادٍ الْخَرَّاطُ، عَنْ كُرَيْبٍ مَوْلَى ابْنِ عَبَّاسٍ، قَالَ: حَدَّثَنَا ابْنُ عَبَّاسٍ قَالَ: كَانَ النَّبِيُّ صلى الله عليه وسلم يُعَلِّمُنَا هَذَا الدُّعَاءَ كَمَا يُعَلِّمُنَا السُّورَةَ مِنَ الْقُرْآنِ: أَعُوذُ بِكَ مِنْ عَذَابِ جَهَنَّمَ، وَأَعُوذُ بِكَ مِنْ عَذَابِ الْقَبْرِ، وَأَعُوذُ بِكَ مِنْ فِتْنَةِ الْمَسِيحِ الدَّجَّالِ، وَأَعُوذُ بِكَ مِنْ فِتْنَةِ الْمَحْيَا وَالْمَمَاتِ، وَأَعُوذُ بِكَ مِنْ فِتْنَةِ الْقَبْرِ.
sunnah.com