What Sins Does God Not Forgive?

The Bible names one sin that will not be forgiven: the blasphemy against the Holy Spirit, sometimes called the unforgivable sin. Jesus said every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven, either in this age or the one to come (Matthew 12:31–32). Scripture also speaks of a “sin unto death” (1 John 5:16, KJV). That is the plain answer. But it raises a second question quickly: what is that sin, and could a person commit it without knowing?

If you are carrying heavy guilt and fear that you have crossed a line, please read this carefully. The very fact that you are concerned is a sign of a tender conscience, not a hardened one. A person who has truly committed the unforgivable sin does not usually lie awake worrying about it. Still, if these thoughts are pushing you toward despair or self-harm, please reach out now. In the United States and Canada call or text 988. In the United Kingdom and Ireland call Samaritans on 116 123. In Australia call Lifeline on 13 11 14. Anywhere else, visit findahelpline.com or call your local emergency number.

What exactly is the unforgivable sin?

The context in Matthew 12 matters. Jesus had just healed a demon-possessed man, and the Pharisees, watching the man’s sight and speech restored, said He drove out demons by Beelzebub, the prince of demons. They were not confused. They were looking at the unmistakable work of the Holy Spirit and calling it the work of Satan. Jesus warned them that this kind of settled, deliberate rejection — attributing the Spirit’s own testimony to the devil — puts a person beyond forgiveness, because it cuts off the very means by which God brings anyone to repentance.

So the unforgivable sin is not a single bad thought or a moment of doubt. It is a persistent, knowing rejection of the Holy Spirit’s witness to Christ, a refusal so complete that the person no longer wants to be forgiven. The writer of Hebrews describes something similar: if we deliberately keep on sinning after receiving the knowledge of the truth, no sacrifice for sins is left (Hebrews 10:26). The danger is not that God is unwilling; it is that the heart has stopped asking.

Does God really forgive every other sin?

Yes. Scripture is emphatic. When David confessed his adultery and murder, Nathan assured him that the LORD had taken away his sin and that he would not die (2 Samuel 12:13). David had done what the law punished with death, and God forgave him. Psalm 32 opens with the joy of that forgiveness:

Blessed is he whose transgressions are forgiven, whose sins are covered. — Psalm 32:1 (BSB)

Acts 13:38–39 announces that through Jesus, forgiveness of sins is proclaimed to everyone who believes, and that everyone who believes is justified from everything the law of Moses could not justify you from. The Heidelberg Catechism puts it simply: God, for the sake of Christ’s satisfaction, will no more remember my sins, nor my corrupt nature, against which I have to struggle all my life long. That is the promise held out to every repentant sinner.

What about the “sin unto death” in 1 John 5:16?

John distinguishes between a sin that leads to death and one that does not. He does not name the specific sin, but most readers through church history have connected it to the blasphemy against the Spirit — a final, settled rejection of Christ. Some also connect it to the kind of defiant, high-handed sin described in Psalm 19:13, where the psalmist prays to be kept from presumptuous sins. The point is not to hand you a checklist so you can test yourself into anxiety. It is to say that there is a hardness of heart so complete that a person no longer repents, and that is a serious thing.

If you are reading this and still want God’s forgiveness, you have not committed that sin. A hardened heart does not seek God. The desire for mercy is itself evidence that the Spirit is still at work in you.

Is there a sin God will not forgive if I keep doing it?

Scripture never teaches that a particular sin is too big for the blood of Christ. It does warn against presuming on grace. Proverbs 28:9 says that if anyone turns a deaf ear to the law, even his prayers are detestable. The problem there is not the size of the sin but the posture of the heart — a person who refuses to obey and yet expects God to bless. The parable of the unforgiving servant (Matthew 18:21–35) makes a similar point: someone who has been forgiven much and then refuses to forgive others shows that he never understood the mercy he received.

What God does not forgive is not a category of wrongdoing but an attitude of final, unrepentant rejection. Where there is confession, there is forgiveness. “If we confess our sins, He is faithful and just to forgive us our sins and to cleanse us from all unrighteousness” (1 John 1:9).

What should I do if I am afraid I have committed it?

First, stop trying to diagnose yourself. The fear itself is a sign that your conscience is alive. Bring that fear to God in prayer. Tell Him plainly what you are afraid of. Then open your Bible and read the promises again — Psalm 32, Psalm 103, 1 John 1:9, Romans 8:1. Let the words sit with you.

Second, speak to a pastor or a mature believer in person. Confession is not meant to be carried alone. For Roman Catholics, sacramental confession is made to a priest, and this site does not replace that. For everyone, the New Testament pattern is to confess sins to one another and pray for one another (James 5:16). A trusted pastor can help you see whether your fear is the Spirit’s conviction leading to repentance or the enemy’s accusation leading to despair. Those two feel similar but lead in opposite directions.

Third, if you are struggling with thoughts of suicide or self-harm, please use the crisis resources above and speak to a doctor or licensed counsellor. God is not served by your destruction. He is near to the brokenhearted.

Where does this leave me?

The Bible’s answer to “what sins does God not forgive?” is not a long list. It is one sin: the final, knowing rejection of the Holy Spirit’s testimony to Christ. Every other sin — adultery, murder, theft, blasphemy, unbelief that repents — is forgivable because of what Jesus did on the cross. He bore the penalty. He rose again. He is able to save completely those who come to God through Him.

If you are still breathing, there is still time to turn. Do not wait until you feel worthy; come as you are. Read Psalm 51 and make it your own. Pray honestly. Find a local church where the Bible is taught and the gospel is preached, and let other believers walk with you. The promise stands: everyone who calls on the name of the Lord will be saved. That includes you.

If you are in crisis, please reach out. In the United States and Canada call or text 988. In the United Kingdom and Ireland call Samaritans on 116 123. In Australia call Lifeline on 13 11 14. Anywhere else, visit findahelpline.com or call your local emergency number.

Questions people ask

Can a Christian commit the unforgivable sin?

The unforgivable sin is a settled, final rejection of the Holy Spirit’s witness to Christ, not a single act or a moment of doubt. A true believer may fall into serious sin, but the Spirit’s ongoing work of conviction and repentance is evidence that the heart has not been finally hardened. If you fear you have committed it, that fear itself suggests you have not.

What is the sin unto death in 1 John 5:16?

John does not define it precisely, but most interpreters connect it with the blasphemy against the Holy Spirit — a deliberate, persistent rejection of Christ that leads to spiritual death. It is not a sin a believer can commit accidentally or in a moment of weakness. John encourages prayer for those whose sin does not lead to death, trusting God’s mercy.

Does God forgive repeated sins?

Yes, when there is genuine repentance. Jesus told Peter to forgive seventy times seven, and God’s mercy is greater than ours. The warning in Scripture is against presuming on grace while refusing to turn from sin, not against the person who keeps coming back to God in honest confession. 1 John 1:9 promises cleansing for all who confess.

How do I know if I have truly repented?

Repentance involves a change of mind that leads to a change of direction. It is not merely feeling sorry, but turning from sin toward God. If you hate your sin, want to be free from it, and are taking practical steps to obey Christ, that is the fruit of repentance. Speak with a pastor who can help you examine your heart and point you to Christ.