The Prophet [SAW] used to seek refuge with Allah from the torment of the grave and the tribulation of the Dajjal, and he said: "You will be tried in your graves."  

أَنَّ النَّبِيَّ ﷺ كَانَ يَسْتَعِيذُ بِاللَّهِ مِنْ عَذَابِ الْقَبْرِ وَمِنْ فِتْنَةِ الدَّجَّالِ قَالَ وَقَالَ إِنَّكُمْ تُفْتَنُونَ فِي قُبُورِكُمْ