I saw an angel coming down out of heaven. He had the key to the Abyss. In his hand he held a heavy chain.
References for Revelation 20:1
He grabbed the dragon, that old serpent. The serpent is also called the devil, or Satan. The angel put him in chains for 1,000 years.
Then he threw him into the Abyss. He locked it and sealed him in. This was to keep Satan from fooling the nations anymore until the 1,000 years were ended. After that, he must be set free for a short time.
I saw thrones. Those who had been given authority to judge were sitting on them. I also saw the souls of those whose heads had been cut off because they had given witness for Jesus and because of God's word. They had not worshiped the beast or his statue. They had not received his mark on their foreheads or hands. They came to life and ruled with Christ for 1,000 years.
This is the first resurrection. The rest of the dead did not come to life until the 1,000 years were ended.
Blessed and holy are those who take part in the first resurrection. The second death has no power over them. They will be priests of God and of Christ. They will rule with him for 1,000 years.