Revelation 20:7

New American Bible - revised edition

When the thousand years are completed, Satan will be released from his prison.

Cross References

Revelation 20:2

He seized the dragon, the ancient serpent, which is the Devil or Satan, and tied it up for a thousand years

Revelation 9:15

So the four angels were released, who were prepared for this hour, day, month, and year to kill a third of the human race.