8 Bible Verses about Apostate Believers

Brethren, even if anyone is caught in a trespass, you who are spiritual, restore such a one in a spirit of gentleness; each one looking to yourself, so that you too will not be tempted.

In the name of our Lord Jesus, when you are assembled, and I with you in spirit, and the power of our Lord Jesus is present, you are to deliver this man to Satan for the destruction of the flesh, so that his spirit may be saved in the day of the Lord Jesus.

My brethren, if anyone among you wanders from the truth and someone brings him back, let him know that whoever turns a sinner from the error of his way will save his soul from death and will cover a multitude of sins.

If anyone sees his brother commit a sin that does not lead to death, he will ask, and God will give him life for those whose sin is not leading to death. There is sin leading to death. I do not say that he should pray about that. All wrongdoing is sin, and there is sin that does not lead to death.

let him know that whoever turns a sinner from the error of his way will save his soul from death and will cover a multitude of sins.

For it is impossible for those who have once been enlightened, who have tasted the heavenly gift, and have become partakers of the Holy Spirit, and have tasted the goodness of the word of God and the powers of the age to come, and then have fallen away, to renew them again to repentance, since they crucify again for themselves the Son of God, and put him to an open shame.read more.
For land which drinks the rain that often falls upon it, and brings forth vegetation useful to those for whose sake it is cultivated, receives a blessing from God. But if it bears thorns and thistles, it is worthless and near to being cursed; its end is to be burned.

For if we sin deliberately after we have received the knowledge of the truth, there no longer remains a sacrifice for sins, but a fearful expectation of judgment, and a fury of fire which will consume the adversaries. Anyone who has rejected the law of Moses dies without mercy on the testimony of two or three witnesses.read more.
How much severer punishment do you think a man will deserve who has trampled under foot the Son of God, and has regarded as an unclean thing the blood of the covenant by which he was sanctified, and has insulted the Spirit of grace?

So then, because you are lukewarm, and neither cold nor hot, I will spit you out of my mouth.