8 Bible Verses about Warnings Against Apostasy

They went away from us, but they were not of us. For, if they had been of us, they would have abode with us; but they went away, that they might be made manifest that they were not of us.

Therefore, beloved, foreknowing these things, be on your guard; lest being also carried away by the deceit of the lawless, you fall from your own steadfastness.

But there were also false prophets among the people, even as there will be false teachers among you; who will privately introduce destructive sects, denying even the Lord who bought them, bringing on themselves swift destruction. And many will follow their lewd practices, on account of whom, they way of truth will be evil spoken of. And through covetousness, they will make merchandise of you, by fictitious tales: to whom the punishment threatened of old lingers not, and their destruction slumbers not.

but especially those who go after the flesh in the lust of uncleanness, and who despise government: being audacious, self-willed, who fear not to revile dignitaries; whereas, angels, who are greater in strength and power, do not bring a reviling accusation against them before the Lord. But these, as natural, irrational animals, made for capture and destruction, speaking evil of matters which they do not understand, shall be utterly destroyed by their own corruptions;read more.
receiving the due reward of unrighteousness. These delight to spend the day in luxurious festivity: they are spots and blemishes, reveling in their deceits when they feast with you; having eyes full of the adulteress, incessantly sinning, alluring unstable souls; having a heart exercised with insatiable desires; an accursed progeny: having forsaken the right path, they have wandered, following in the way of Balaam, the son of Bosor, who loved the wages of iniquity,

Now, if, having fled away from the pollutions of the world, through the knowledge of the Lord and Saviour Jesus Christ, and being again entangled, they are overcome by them; their last condition is worse than the first. Therefore, it has been better for them not to have known the way of righteousness, than having known it, turn away from the holy commandment delivered to them. But the saying of the true proverb has happened to them: "The dog is returned to his own vomit; and the washed hog, to its wallowing in the mire."

For certain men have come in privily, who long ago were before written to this very condemnation; ungodly men, perverting the favor of our God to lasciviousness, and denying the only sovereign Lord, even our Lord Jesus Christ.

Truly, in like manner, also, shall these dreamers be punished-who, indeed, defile the flesh, despise authority, and blaspheme dignities. Whereas, Michael, the Arch Angel, when contending with the devil, (he disputed about the body of Moses,) did not attempt to bring against him a reviling accusation, but said, "The Lord rebuke": but these, indeed, revile those things which they do not know; but what things they do know, naturally, as animals void of reason, by these things they destroy themselves.read more.
Alas for them! for they have gone in the way of Cain, and have run evidently in the error of Balaam's hire, and have perished in the rebellion of Korah. These men are spots in love feasts, when they feast with you, feeding themselves without fear. They are clouds without water, carried about of winds: withered autumnal trees without fruit; twice dead; rooted out; raging waves of the sea, foaming out their own shame; wandering stars, for whom the blackness of darkness for ever is reserved. Now, Enoch, the seventh from Adam, prophesied, indeed, concerning these men; saying, "Behold, the Lord comes with his myriads of holy angels, to pass sentence on all, and to convict all the ungodly among them, of all their deeds of ungodliness; which they have impiously committed; and of all the hard things which ungodly sinners have spoken against him." These are murmurers, and complainers, who walk according to their own lusts; and their mouths speak great swelling words. They admire persons for the sake of gain.

Nevertheless, I have against you, that you permit that woman Jezebel, who says that she is a prophetess, to teach and to seduce my servants to commit fornication, and to eat things sacrificed to idols. And I have given her time to reform from her fornication, and she reforms not. Behold, I will cast her into a bed, and those who commit adultery with her, into great tribulation, unless they reform from their works;