And he laid hold on the dragon, that old serpent, which is the Devil, and Satan, and bound him {3} a thousand years,

(3) The first of which (continuing this history with the end of the second chapter) in the 36 years from the passion of Christ, when the Church of the Jews being overthrown, Satan attempted to invade the Christian church gathered from the Gentiles, and to destroy part of her seed, Re 12:17. The thousandth year falls precisely on the times of that wicked Hildebrand, who was called Gregory the seventh, a most damnable necromancer and sorcerer, whom Satan used as an instrument when he was loosed out of bonds, from then on to annoy the saints of God with most cruel persecutions, and the whole world with dissentions, and most bloody wars: as Benno the Cardinal reports at large. This is the first victory gained over the dragon in the earth.

People's New Testament

20:2 He laid hold on the dragon... and bound him for a thousand years. The chain (Re 20:1) I suppose to be the Word of God. At this period of the triumph of righteousness the gospel takes such hold of the hearts of men that Satan loses his powers over them. We can easily see how this is accomplished by what takes place under our own eyes. A man may be drunken and lawless, but if he repents under the influence of the gospel he ceases to serve Satan. The devil loses his power over that man. When that period shall come for which the saints in all ages have wistfully looked, when the laws of God shall be written upon every heart, then Satan, bound with a chain, the chain of truth, shall be deprived of influence on the earth.

Wesley's Notes

20:2 And he laid hold on the dragon - With whom undoubtedly his angels were now cast into the bottomless pit, as well as finally into everlasting fire, Matt 25:41. And bound him a thousand years - That these thousand do not precede, or run parallel with, but wholly follow, the times of the beast, may manifestly appear,
1. From the series of the whole book, representing one continued chain of events.
2. From the circumstances which precede. The woman's bringing forth is followed by the casting of the dragon out of heaven to the earth. With this is connected the third woe, whereby the dragon through, and with, the beast, rages horribly. At the conclusion of the third woe the beast is overthrown and cast into the lake of fire. At the same time the other grand enemy, the dragon, shall be bound and shut up.
3. These thousand years bring a new, full, and lasting immunity from all outward and inward evils, the authors of which are now removed, and an affluence of all blessings. But such time the church has never yet seen. Therefore it is still to come.
4. These thousand years are followed by the last times of the world, the letting loose of Satan, who gathers together Gog and Magog, and is thrown to the beast and false prophet in the lake of fire. Now Satan's accusing the saints in heaven, his rage on earth, his imprisonment in the abyss, his seducing Gog and Magog, and being cast into the lake of fire, evidently succeed each other.
5. What occurs from Rev 20:11 - Rev 22:5, manifestly follows the things related in the nineteenth chapter . The thousand years came between; whereas if they were past, neither the beginning nor the end of them would fall within this period. In a short time those who assert that they are now at hand will appear to have spoken the truth. Meantime let every man consider what kind of happiness he expects therein. The danger does not lie in maintaining that the thousand years are yet to come; but in interpreting them, whether past or to come, in a gross and carnal sense. The doctrine of the Son of God is a mystery. So is his cross; and so is his glory. In all these he is a sign that is spoken against. Happy they who believe and confess him in all!

Scofield Reference Notes

[3] thousand years

The duration of the kingdom of heaven in its mediatorial form See Scofield Note: "1Cor 15:24".

Jamieson-Fausset-Brown Bible Commentary

2. that old-ancient serpent (Re 12:9).

thousand years-As seven mystically implies universality, so a thousand implies perfection, whether in good or evil [Aquinas on ch. 11]. Thousand symbolizes that the world is perfectly leavened and pervaded by the divine; since thousand is ten, the number of the world, raised to the third power, three being the number of God [Auberlen]. It may denote literally also a thousand years.

Matthew Henry's Concise Commentary

20:1-3 Here is a vision, showing by a figure the restraints laid on Satan himself. Christ, with Almighty power, will keep the devil from deceiving mankind as he has hitherto done. He never wants power and instruments to break the power of Satan. Christ shuts by his power, and seals by his authority. The church shall have a time of peace and prosperity, but all her trials are not yet over.