4 And I saw thrones, and they sat on them, and judgment was committed to them. Then I saw the souls of those who had been beheaded for their witness to Jesus and for the word of God, who had not worshiped the beast or his image, and had not received his mark on their foreheads or on their hands. And they lived and reigned with Christ for a thousand years.
So if the Saints are Reigning with Christ who are they Reigning over? why the nations that Jesus is ruling over with an Iron Rod. So at the end of the 1000 years Revelation tells us that satan shall be released from the bottomless pit to go out and deceive these nations to bring them Gog and Magog to attack Jerusalem to surround it and the Camp of the Saints.
7 Now when the thousand years have expired, Satan will be released from his prison 8 and will go out to deceive the nations
which are in the four corners of the earth, Gog and Magog
, to gather them together to battle, whose number is as the sand of the sea. 9 They went up on the breadth of the earth and surrounded the camp of the saints and the beloved city
. And fire came down from God out of heaven and devoured them.
Satan is not going to be released to go out and deceive the resurrected Saints, who shall never be deceived again after they are given their eternal bodies 1000 years earlier. Satan is released to go out and deceive the flesh nations that have been under the rule of Jesus and the Saints for 1000 years.