Revelation 20:1 And I saw an angel come down from heaven, having the key of the bottomless pit and a great chain in his hand. 2 And he laid hold on the dragon, that old serpent, which is the Devil, and Satan, and bound him a thousand years.
The Great Controversy pp 660>661] For a thousand years, Satan will wander to and fro in the desolate earth, to behold the results of his rebellion against the law of God. During this time his sufferings are intense. Since his fall, his life of unceasing activity has banished reflection; but he is now deprived of his power, and left to contemplate the part which he has acted since first he rebelled against the government of Heaven, and to look forward with trembling and terror to the dreadful future, when he must suffer for all the evil that he has done, and be punished for the sins that he has caused to be committed.
To God's people, the captivity of Satan will bring gladness and rejoicing. Says the prophet: “It shall come to pass in the day that the Lord shall give thee rest from thy sorrow, and from thy trouble, and from the hard service wherein thou wast made to serve, that thou shalt take up this proverb against the king of Babylon [here representing Satan], and say, How hath the oppressor ceased! ... The Lord hath broken the staff of the wicked, the scepter of the rulers; that smote the peoples in wrath with a continual stroke, that ruled the nations in anger, with a persecution that none restrained.” [Isaiah 14:3-6, Revised Version.]
During the thousand years between the first and the second resurrection, the Judgment of the wicked takes place. The apostle Paul points to this Judgment as an event that follows the second advent. “Judge nothing before the time, until the Lord come, who both will bring to light the hidden things of darkness, and will make manifest the counsels of the hearts.” [1 Corinthians 4:5.] Daniel declares that when the Ancient of days came, “Judgment was given to the saints of the Most High.” [Daniel 7:22.] At this time the righteous reign as kings and priests unto God.
Revelation 20:4 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 worshiped 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.
May The Lord add His blessing to the study of His word. God bless!