Revelation 20:7-9

7When the 1,000 years have finished, God will let Satan go free out of his prison.

8Satan will then go and deceive people in nations everywhere in the world. He will make them believe him. Those nations are God's enemies, Gog and Magog. Satan will bring them together to fight a war against God's people. Satan's army has many people, as much as the sand on the shore of the sea.

9I saw them as they marched over the whole earth. They arrived at the city which God loves. That is where God's people had made their camp. Satan's army made their camp all around the city. Then fire came down from heaven and it destroyed them completely.