All the flesh ( human beings ) of man will perish during this temporary generation because they are born of Satan. In one hour on the day of the Lord, all flesh will be destroyed and burned up in the fire of God.
Revelation 18
7: As she glorified herself and played the wanton, so give her a like measure of torment and mourning. Since in her heart she says, `A queen I sit, I am no widow, mourning I shall never see,'
8: so shall her plagues come in a single day, pestilence and mourning and famine, and she shall be burned with fire; for mighty is the Lord God who judges her."
9: And the kings of the earth, who committed fornication and were wanton with her, will weep and wail over her when they see the smoke of her burning;
10: they will stand far off, in fear of her torment, and say, "Alas! alas! thou great city, thou mighty city, Babylon! In one hour has thy judgment come."
17: In one hour all this wealth has been laid waste." And all shipmasters and seafaring men, sailors and all whose trade is on the sea, stood far off
Zephaniah 1
18: Neither their silver nor their gold shall be able to deliver them on the day of the wrath of the LORD. In the fire of his jealous wrath, all the earth shall be consumed; for a full, yea, sudden end he will make of all the inhabitants of the earth.