Revelation 20:7

A Conservative Version

And when the thousand years are ended, Satan will be loosed out of his prison.

Cross References

Revelation 20:2

And he seized the dragon, the old serpent, who is the Devil and Satan, who leads the whole world astray, and bound him a thousand years.

Revelation 9:15

And the four agents were loosed, who were prepared for the hour and for the day and month and year, so that they would kill the third part of men.