Revelation 20:7-8

And when the thousand years are completed, Satan will be released from his place of confinement, And he will go forth to deceive and seduce and lead astray the nations which are in the four quarters of the earth–Gog and Magog–to muster them for war; their number is like the sand of the sea. [Ezek. 38:2, 9, 15, 22.]