Matthew 24: 40-42. “Then shall two be in the field: the one shall be tken, and the other left. Two women shall be grinding at the mill; the one shall be taken, and the other left. Watch therefore: for ye know not what hour your Lord doth come.”
The previous verses refer clearly to the second coming of the Lord Jesus, NOT to the Rapture. Verse 40 starts with the word Then, continuing in the theme of the second coming. When He returns, Armageddon takes place. Some will die, some will be left alive. References for further study include Luke 17:26; 21:34; Rev. 19:21; Zech. 14:16; and Ezek. 39:2.
Like the Flood, people were “taken.” That is, they were destroyed. Even in spite of Noah’s warning and preaching, they ignored and mocked the idea that there would be a universal judgment in which all would die except those who entered the ark. When God opened the floodgates, the results were sudden and overwhelming. There was no escape, no mountain high enough to keep them out of reach of the flood waters.
The Battle of Armageddon will have a similar effect: The destruction of many will take place, whose carcases will be eaten by the fowls of Matthew 24:28; Luke 17:34-37;Ezek 29:17-32; and Rev. 19:17-21. There will, however, be many left alive. The judgment will not be a complete as was that of the Flood. Those who survive Armageddon will go on to live on the earth during the Millenial Kingdom.
Because no one knows the day or the hour when Christ will return to earth with His raptured saints, those who remain are warned to watch, to be aware, to be ready for that visible, incredible return of Jesus Christ with His armies.