Bible Verses About Mortal Sin

If any man see his brother sin a sin which is not unto death, he shall ask, and he shall give him life for them that sin not unto death. There is a sin unto death: I do not say that he shall pray for it.

Primary Bible text for sin leading to death

For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins,

Direct warning about willful sin after knowledge

Of how much sorer punishment, suppose ye, shall he be thought worthy, who hath trodden under foot the Son of God, and hath counted the blood of the covenant, wherewith he was sanctified, an unholy thing, and hath done despite unto the Spirit of grace?

Direct warning about severe punishment after apostasy

For it had been better for them not to have known the way of righteousness, than, after they have known it, to turn from the holy commandment delivered unto them.

Shows turning away after knowing righteousness

All unrighteousness is sin: and there is a sin not unto death.

Short parallel to 1 John 5:16

For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning.

Shows later end worse after returning to sin

And if a soul sin, and commit any of these things which are forbidden to be done by the commandments of the LORD; though he wist it not, yet is he guilty, and shall bear his iniquity.

Scripture passage attached to the early Christian evidence page.

Having damnation, because they have cast off their first faith.

Scripture passage attached to the early Christian evidence page.

Then when lust hath conceived, it bringeth forth sin: and sin, when it is finished, bringeth forth death.

Scripture passage attached to the early Christian evidence page.

But he that sinneth against me wrongeth his own soul: all they that hate me love death.

Scripture passage attached to the early Christian evidence page.

But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death.

Lists murderers, sexually immoral, sorcerers, idolaters, and liars in the second death text

They went out from us, but they were not of us; for if they had been of us, they would no doubt have continued with us: but they went out, that they might be made manifest that they were not all of us.

Used by early writers for those who depart from the community

But the soul that doeth ought presumptuously, whether he be born in the land, or a stranger, the same reproacheth the LORD; and that soul shall be cut off from among his people.

Scripture passage attached to the early Christian evidence page.

Was then that which is good made death unto me? God forbid. But sin, that it might appear sin, working death in me by that which is good; that sin by the commandment might become exceeding sinful.

Scripture passage attached to the early Christian evidence page.

Who knowing the judgment of God, that they which commit such things are worthy of death, not only do the same, but have pleasure in them that do them.

Scripture passage attached to the early Christian evidence page.

And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved.

Scripture passage attached to the early Christian evidence page.

The sting of death is sin; and the strength of sin is the law.

Scripture passage attached to the early Christian evidence page.

If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame.

Direct passage about falling away and repentance

Thine own wickedness shall correct thee, and thy backslidings shall reprove thee: know therefore and see that it is an evil thing and bitter, that thou hast forsaken the LORD thy God, and that my fear is not in thee, saith the Lord GOD of hosts.

Apostasy is called bitter and evil

And if the whole congregation of Israel sin through ignorance, and the thing be hid from the eyes of the assembly, and they have done somewhat against any of the commandments of the LORD concerning things which should not be done, and are guilty;

Scripture passage attached to the early Christian evidence page.

If a soul commit a trespass, and sin through ignorance, in the holy things of the LORD; then he shall bring for his trespass unto the LORD a ram without blemish out of the flocks, with thy estimation by shekels of silver, after the shekel of the sanctuary, for a trespass offering.

Scripture passage attached to the early Christian evidence page.

If a soul sin, and commit a trespass against the LORD, and lie unto his neighbour in that which was delivered him to keep, or in fellowship, or in a thing taken away by violence, or hath deceived his neighbour;

Scripture passage attached to the early Christian evidence page.

For sin, taking occasion by the commandment, deceived me, and by it slew me.

Scripture passage attached to the early Christian evidence page.

But if ye will not do so, behold, ye have sinned against the LORD: and be sure your sin will find you out.

Scripture passage attached to the early Christian evidence page.

What fruit had ye then in those things whereof ye are now ashamed? for the end of those things is death.

Scripture passage attached to the early Christian evidence page.

But he that shall blaspheme against the Holy Ghost hath never forgiveness, but is in danger of eternal damnation.

Mark 3:29 directly names unforgiven blasphemy

Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry:

Lists fornication and covetousness as serious sins

For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord.

Scripture passage attached to the early Christian evidence page.

Whosoever committeth sin transgresseth also the law: for sin is the transgression of the law.

Scripture passage attached to the early Christian evidence page.

Of sin, because they believe not on me;

Scripture passage attached to the early Christian evidence page.

But whoso shall offend one of these little ones which believe in me, it were better for him that a millstone were hanged about his neck, and that he were drowned in the depth of the sea.

Warning about causing others to sin and severe judgment

Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned:

Scripture passage attached to the early Christian evidence page.

Wherefore if thy hand or thy foot offend thee, cut them off, and cast them from thee: it is better for thee to enter into life halt or maimed, rather than having two hands or two feet to be cast into everlasting fire.

Warning about sin leading to eternal fire