MATTHEW 24:21- FOR THEN THERE WILL BE A GREAT TRIBULATION, SUCH AS HAS NOT OCCURRED SINCE THE BEGINNING OF THE WORLD UNTIL NOW, NOR EVER WILL.  

REVELATIONS 6:15-17- THEN THE KINGS OF THE EARTH AND THE GREAT HUMANS AND THE COMMANDERS AND THE RICH AND THE STRONG AND EVERY SLAVE AND FREE HUMAN HID THEMSELVES IN THE CAVES AND AMONG THE ROCKS OF THE MOUNTAINS; AND THEY SAID TO THE MOUNTAINS AND TO THE ROCKS, FALL ON US AND HIDE US FROM THE PRESENCE OF HIM WHO SITS ON THE THRONE, AND FROM THE WRATH OF THE LAMB; FOR THE GREAT DAY OF THEIR WRATH HAS COME AND WHO IS ABLE TO STAND?