In Revelation 20:7-10, John tells us what would follow the millennial reign of Christ.

Satan, who had been shut up in the abyss would be released from his prison.

Upon being released, Satan would seek to deceive the nations of the earth. John mentions particularly Gog and Magog. His intention would be to gather the nations to war against the saints and the beloved city. This would constitute a rebellion against the kingship of Jesus over the world.

John tells us that the number who would gather is like the sand of the seashore. We can see the wickedness of sin in this huge number. Despite living under the righteousness rule of Christ, the people living at the end of the thousand years would still follow Satan.

These troops would be positioned on a broad plain and surround the camp of the saints and the beloved city.

However, those who gather would be devoured by fire from heaven.

Satan would be finally thrown into the lake of fire and brimstone.