And angels who had not kept their own original state, but had abandoned their own dwelling, he keeps in eternal chains under gloomy darkness, to the judgment of the great day;
And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day. The next example of apostasy Jude gives in his epistle is in reference to the fallen angels. These angels had their beginnings in Christ, for He spoke them into existence. They owed their allegiance to Him but were not content to remain in His presence. They departed from their own habitation, the presence of Christ. The verb for 'kept' in this verse is the same as the verb for 'reserved' as well. This makes an interesting play on words; we could well paraphrase this verse as "The angels which did not hold fast their origin, but departed from their dwelling place, he has held them fast in eternal chains for the judgement day." There is a parallell between this verse and 2 Peter 2:4 which says : "For if God spared not the angels who had sinned, but having cast them down to the deepest pit of gloom has delivered them to chains of darkness to be kept for judgment;" And what can we say of false teachers who rebel in the same manner as these angels? The previous verse provides the answer to their judgement: "And through covetousness, with well-turned words, will they make merchandise of you: for whom judgement is not idle, and their destruction slumbers not." (2 Peter 2:3)
It may be helpful to consider the first angel to committ apostasy, the chief angel, Lucifer. In the 14th chapter of Isaiah we read of his downfall, which seceded his prideful attempt to overthrow the throne. Isaiah 14:12-15 states: "How art thou fallen from heaven, O Lucifer, son of the morning! How art thou cut down to the ground, which didst weaken the nations! For thou hast said in thine heart, I will ascend into heaven, I will exalt my throne above the stars of God: I will sit also upon the mount of the congregation, in the sides of the north: I will ascend above the heights of the clouds; I will be like the most High. Yet thou shalt be brought down to hell, to the sides of the pit." We can see the apparent discontent of Lucifer and his first habitation. We can also see the consequence of his departure; Lucifer was brought down to hell, the sides or very back, of the pit, or dungeon. Although Lucifer, who we know today as Satan, the Devil, is currently roaming the earth seeking whom he may devour, Satan will not be bound in a dungeon, or the bottomless pit more specifically, until after the 7-year Tribulation. It is, however, comforting to read this passage in Isaiah from God's viewpoint in that He being eternal and outside of time sees Satan's judgement as already accomplished.