2000 years ago, John was taken to the “The Lord’s Day” and through him, God reveals this prophecy to you; 2 Peter 3:8 KJV tells how it received its name:
But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day.
Recognizing “The Lord’s Day” to be 1000 years, Rev: 20:1 KJV introduces you to its beginning:
And I saw an angel come down from heaven, having the key of the bottomless pit and a great chain in his hand.
Michael is the likely candidate to be holding that great chain as Rev. 12:7-8 KJV tells of a battle involving Michael and Satan, a battle taking place just before Satan is booted back to Earth on “The Lord’s Day”:
And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels,  And prevailed not; neither was their place found any more in heaven.
After being booted from heaven, Revelation 20: 2-3 KJV shows Satan physically bound here for 1000 years:
And he laid hold on the dragon, that old serpent, which is the Devil, and Satan, and bound him a thousand years,  And cast him into the bottomless pit, and shut him up, and set a seal upon him, that he should deceive the nations no more, till the thousand years should be fulfilled: and after that he must be loosed a little season.
Satan’s evil spirit deceives now but with him locked up, he has no access to you for 1000 years.
What a relief, imagine having a thousand years without being exposed to him. With Satan removed from the picture, you can view “The Lord’s Day” as a 1000 year revival, a good time to guide lost ones to the Lord, huh?
Remembering that God took John forward to reveal “The Lord’s Day” and its events to you, Rev. 20:4 KJV reads:
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 Lord’s Day” is taking place and John is telling what he sees. Satan’s mark, being absent from your forehead, means you have been sealed by God.
Your job is to reign and teach with Christ for 1000 years! Reigning is