Introduction: We have done a very comprehensive (certainly not exhaustive) study on what’s been called the Millennium on TTUF. Check it out here!
In REVELATION 20 a 1,000 year period of time is mentioned six times, and it deals with specific people and details that necessarily dismisses this as a mere allegory. Two things happen immediately that commences this new era on the Earth;
The LORD Jesus Christ returns from heaven to Earth just as was promised in the Scriptures (MATT 24:30-31; ACTS 1:11; 2 THESS 1:7-10; TITUS 2:13; ISAIAH 34:6; 63:1; HOS 5:15; ZECH 14:5 to name but a few) and the binding of the dragon aka the Devil, or Satan.
I don’t think it’s a stretch to suggest that Satan is going to have a lot of company there in “the bottomless pit” – all the principalities, powers, the rulers of the darkness of this world, the spiritual wickedness (EPH 6:12), all of these fallen angels (2 PET 2:4) and the demons as well (MATT 8:28-29).
Some have suggested that the rest of his kingdom will be immediately consigned to the flames of Gehenna prior to the Millennium, but that doesn’t seem likely because Paul the apostle said that we (the church) will one day judge angels (1 COR 6:3); so there would have to be some (fallen) angels to judge, and it doesn’t seem likely, not to mention that Scripture is silent about these spiritual beings of the dark kind are temporarily released from Gehenna only to be returned there after the Judgment!
This 1,000 year reign will be an era completely pure of any wicked and unclean spirits; thus mankind will not experience tempters who now seek to lure people into sin, trespasses, transgressions, wickedness, abominations, and blasphemies.
In contrast, the holiness, the righteousness, the justice as well as the grace, truth, peace, and joy of the LORD Jesus Christ will be realized among the nations, and preeminently, the nation of Israel and the church also, she who is the bride of Christ!
Yet this will not be an entirely sinless era because death is still present (just rare; ISAIAH 65:20), brief pockets of rebellion will be occurring, but instantly dealt with (See ZECH 14; esp. vs.16-19), by Christ’s “rod of iron” (REV 12:5; PSALM 2:9); we the church will bear this authority as well (REV 2:27).
Let’s explore then, this remarkable era that will bless us saints when we, after the rapture, and the blessed time in heaven with our LORD, shall return to Earth under His righteous and blessed management!