In the future, at the end of the Tribulation, an angel will descend from heaven with the key of the abyss and with a great chain in his hand (Rev. 20:1). The fact he has the key and the chain shows he has been given authority and power from heaven to carry out this assignment.
This angel will then lay hold of the dragon, the serpent of old, who is the devil and Satan and will bind him for a thousand years. The emphasis here is that this angel, operating under God’s authority and with His power, will possess the strength necessary to seize, hold firmly, and restrain the devil and bind him in the abyss for a thousand years with no possibility of escape.
“Then I saw an angel coming down from heaven, having the key to the bottomless pit [abussou] and a great chain in his hand. He laid hold of the dragon, that serpent of old, who is the Devil and Satan, and bound him for a thousand years; and he cast him into the bottomless pit [abusson], and shut him up, and set a seal on him, so that he should deceive the nations no more till the thousand years were finished. But after these things he must be released for a little while. “Revelation 20:1
“So it will happen in that day, that the Lord will punish the host of heaven on high, and the kings of the earth on earth. They will be gathered together like prisoners in the dungeon, and will be confined in prison; and after many days they will be punished.”Isaiah 24:21
Revelation 19 describes the battle between the forces of the Antichrist and Yeshua at the end of this age. After the defeat and destruction of “the beast” and “the false prophet,” the Bible reveals that Satan himself will be captured and imprisoned for a thousand years.
“And when the thousand years are ended, Satan will be loosed from his prison and will come out to deceive the nations which are at the four corners of the earth, that is, Gog and Magog, to gather them for battle; their number is like the sand of the sea. And they marched up over the broad earth and surrounded the camp of the saints and the beloved city; but fire came down from heaven and consumed them, and the devil who had deceived them was thrown into the lake of fire and sulphur where the beast and the false prophet were, and they will be tormented day and night for ever and ever.”Revelation 20:7
During the millennial kingdom Satan will be bound, but at the close of that period he will be released and will attempt to lead the world in a final revolt against Christ’s kingdom. Finally God will cast Satan into the lake of fire and brimstone where he will be tormented for ever and ever Revelation.