Jude, the Bible's penultimate book, was written by Jesus' younger brother, son of Mary and Joseph. It's a warning against antichrists
The sin and doom of Godless men
4For certain men whose condemnation was written about long ago have secretly slipped in among you. They are godless men, who change the grace of our God into a license for immorality and deny Jesus Christ our only Sovereign and Lord.
5Though you already know all this, I want to remind you that the Lord delivered his people out of Egypt, but later destroyed those who did not believe.
6And the angels who did not keep their positions of authority but abandoned their own home—these he has kept in darkness, bound with everlasting chains for judgment on the great Day.
7In a similar way, Sodom and Gomorrah and the surrounding towns gave themselves up to sexual immorality and perversion. They serve as an example of those who suffer the punishment of eternal fire.
8In the very same way, these dreamers pollute their own bodies, reject authority and slander celestial beings.
9But even the archangel Michael, when he was disputing with the devil about the body of Moses, did not dare to bring a slanderous accusation against him, but said, "The Lord rebuke you!"
10Yet these men speak abusively against whatever they do not understand; and what things they do understand by instinct, like unreasoning animals—these are the very things that destroy them.
11Woe to them! They have taken the way of Cain; they have rushed for profit into Balaam's error; they have been destroyed in Korah's rebellion.
12These men are blemishes at your love feasts, eating with you without the slightest qualm—shepherds who feed only themselves. They are clouds without rain, blown along by the wind; autumn trees, without fruit and uprooted—twice dead.
13They are wild waves of the sea, foaming up their shame; wandering stars, for whom blackest darkness has been reserved forever.
14Enoch, the seventh from Adam, prophesied about these men: "See, the Lord is coming with thousands upon thousands of his holy ones
15to judge everyone, and to convict all the ungodly of all the ungodly acts they have done in the ungodly way, and of all the harsh words ungodly sinners have spoken against him."
16These men are grumblers and faultfinders; they follow their own evil desires; they boast about themselves and flatter others for their own advantage.
A call to persevere
18They said to you, "In the last times there will be scoffers who will follow their own ungodly desires."
19These are the men who divide you, who follow mere natural instincts and do not have the Spirit.
22Be merciful to those who doubt;
23snatch others from the fire and save them; to others show mercy, mixed with fear—hating even the clothing stained by corrupted flesh.