(Rev. 20:4 KJV) 4 And I saw thrones, and they sat upon them, and judgment was given unto them: and I saw the souls of them that were beheaded for the witness of Jesus, and for the word of God, and which had not worshipped the beast, neither his image, neither had received his mark upon their foreheads, or in their hands; and they lived and reigned with Christ a thousand years.
The followers of Jesus will give their life because they lived for God rather than worshiping the beast. They will live with Jesus in the millennium.
The saints will judge the world.
(1 Cor. 6:2-3 KJV) 2 Do ye not know that the saints shall judge the world? and if the world shall be judged by you, are ye unworthy to judge the smallest matters?
3 Know ye not that we shall judge angels? how much more things that pertain to this life?
(Lk. 22:30 KJV) 30 That ye may eat and drink at my table in my kingdom, and sit on thrones judging the twelve tribes of Israel.
This includes the Church, the Old Testament saints, and the Tribulation saints.