There is a sin in the Bible so serious that the apostle John says he won’t even tell you to pray about it.
He doesn’t say “pray harder.” He doesn’t say “pray about it more.” He says, “I do not say that he should pray about that.” What doesn’t he want you to pray about? “A sin that leads to death.”
If you’ve ever read that verse by itself, you’ve probably asked yourself three questions. What is this sin? Have I committed it? And if I have, is it already too late for me?
Those are serious questions, and they deserve serious answers. Let’s not guess or provide opinions or gut feelings here. Let’s open the Bible and find out. By the end of this study, you’re going to have Bible answers to all three questions. I’m also going to show you a single sentence, sitting just a few verses earlier in the same chapter, that unlocks this entire passage. Most people don’t even see it when asking these questions. But not us, because we are going to study this passage in context.
Here’s the passage that introduces our questions:
If anyone sees his brother sinning a sin which does not lead to death, he will ask, and He will give him life for those who commit sin not leading to death. There is sin leading to death. I do not say that he should pray about that. All unrighteousness is sin, and there is sin not leading to death.
1 John 5:16–17
Now, before we try to answer anything, I want to teach you a principle that will serve you for the rest of your life as a student of Scripture. When you have a hard Bible question, the answer is almost always found in the context. Not in speculation, a YouTube video, AI, or a sermon. In the text. Who wrote it? Who did he write it to? Why did he write it? What did he just say, and what is he about to say?
When we skip those questions, we tend to pour our own ideas into the passage. That’s called eisegesis, and it’s how a lot of confusion about this verse got started. So let’s do it the right way.
Follow along: who was John writing to? He tells us plainly:
These things I have written to you who believe in the name of the Son of God, that you may know that you have eternal life, and that you may continue to believe in the name of the Son of God.
1 John 5:13
John is writing to Christians. Notice that in the passage we read a moment ago, he says, “If anyone sees his brother sinning.” He is talking about a brother in Christ. So this is not a passage about lost people in the world. It is about Christians who sin.
Second, why was John writing? In addition to his reason given in verse 13 (to provide assurance of salvation), earlier in the letter he says:
These things I have written to you concerning those who try to deceive you.
1 John 2:26
False teachers had risen up. John calls them antichrists. This is likely a group of people in history known as Gnostics, people who denied Jesus had truly come in the flesh. And John says this about them:
They went out from us, but they were not of us; for if they had been of us, they would have continued with us; but they went out that they might be made manifest, that none of them were of us.
1 John 2:19
These were people who had once been in the fellowship and then deliberately walked away from the truth. Keep that in mind as we go along.
By the way, this verse has become a favorite proof text for the doctrine of Once Saved Always Saved. That doctrine really can’t survive the rest of 1 John, as you’re about to see. But that deserves its own study, and we’re working on it.
Third, what does John say about Christians and sin? Have you noticed how the book of 1 John starts? In the first chapter, he says:
But if we walk in the light as He is in the light, we have fellowship with one another, and the blood of Jesus Christ His Son cleanses us from all sin. If we say that we have no sin, we deceive ourselves, and the truth is not in us. If we confess our sins, He is faithful and just to forgive us our sins and to cleanse us from all unrighteousness.
1 John 1:7–9
Notice a few points with me. The cleansing is continual, but it is conditional. It belongs to those who walk in the light. And when we stumble, the forgiveness is complete and continual. John says, “the blood of Jesus Christ His Son cleanses us from all sin” and that God will “cleanse us from all unrighteousness.”
Now go back to our passage. John says, “All unrighteousness is sin, and there is sin not leading to death.” That’s the same word he used in chapter 1. John is deliberately reminding his readers that any unrighteousness can be forgiven when it is confessed by a disciple walking in the light. From beginning to end, this letter is saturated with hope and assurance.
So, what’s my point? The sin leading to death cannot be some special sin that is simply too big for the blood of Jesus. John has already told us the blood of Christ cleanses from all sin. So what is the sin that leads to death?
Remember that sentence I mentioned that will unlock our understanding? Here it is. In the two verses that lead up to our passage, John writes:
Now this is the confidence that we have in Him, that if we ask anything according to His will, He hears us. And if we know that He hears us, whatever we ask, we know that we have the petitions that we have asked of Him.
1 John 5:14–15
“According to His will”—That is the key that unlocks the whole passage. The next verse says:
If anyone sees his brother sinning a sin which does not lead to death, he will ask, and He will give him life for those who commit sin not leading to death. There is sin leading to death. I do not say that he should pray about that.
John goes directly from “ask according to His will” into “pray for your brother who sins.” He is telling us what kind of prayer God will answer. But then he says to not pray for the sin leading to death. Ask yourself: is it God’s will to forgive a person who refuses to repent? The answer is no.
God has never promised forgiveness to the unrepentant. So John is essentially saying, “When your brother stumbles and he is still walking in the light, pray for him. God will give him life. But when a brother has hardened his heart and is determined to keep going in his sin, I’m not telling you to pray for God to forgive him while he stays in that state.” That prayer isn’t according to God’s will.
And this is not an idea unique to John. Listen to James:
Confess your trespasses to one another, and pray for one another, that you may be healed. The effective, fervent prayer of a righteous man avails much.
James 5:16
It’s the same idea. A brother struggles, he confesses, and the church prays for him. A few verses later, James even uses the language of death:
Brethren, if anyone among you wanders from the truth, and someone turns him back, let him know that he who turns a sinner from the error of his way will save a soul from death and cover a multitude of sins.
James 5:19–20
A Christian who wanders and is not turned back is headed toward death. Now listen to the author of Hebrews:
And let us consider one another in order to stir up love and good works, not forsaking the assembling of ourselves together, as is the manner of some, but exhorting one another, and so much the more as you see the Day approaching. For if we sin willfully after we have received the knowledge of the truth, there no longer remains a sacrifice for sins, but a certain fearful expectation of judgment, and fiery indignation which will devour the adversaries.
Hebrews 10:24–27
Just like John and James, the author of Hebrews says that the reason why Christians must be involved in each other’s lives is to encourage and protect each other. Protect each other? From what? A sin leading to death.
Putting this all together, we learn that the sin leading to death is not a single act on a list. It is a settled, willful persistence in sin by someone who knows the truth and refuses to turn back. It’s not a stumble or a momentary lapse of judgment. It’s a direction. In John’s immediate context, the clearest example standing right in front of his readers was the false teachers who had walked out, rejecting the truth about Jesus, and had no intention of coming back.
Now, you may be wondering, “Isn’t this the same as the unforgivable sin Jesus talked about?” That’s a fair question, and many people have connected the two. We’ll get back to that in a minute. For now, let’s return to our three questions.
First, what is the sin unto death? It is any sin a person refuses to repent of. Lying can be a sin not leading to death, and it can be a sin (or a lifestyle) leading to death. The difference isn’t the sin. The difference is the heart and location of the person. Are they walking in the light or walking away from it?
Second, have I committed it? Let me ask you something. Why are you reading this study? If you are worried that you’ve drifted from God, if your conscience is bothering you, if you want to be right with Him, that is not what a hardened heart looks like. A person who is determined to rebel against God usually isn’t losing sleep over it. The concern you feel is evidence that your heart is still soft enough to turn.
That doesn’t mean you can ignore it. If there is sin in your life you’ve been holding on to, the road you are on leads to death. John isn’t trying to make you feel safe in sin. He’s trying to get you out of it. Confess your sins, walk in the light, and ensure you are in fellowship with the body of Christ.
Third, am I eternally doomed? Not if you turn around. Hebrews 10 describes a person who keeps on sinning willfully. As long as someone stays on that road, there is no sacrifice left for him, because he is rejecting the only one there is. This is also why the doctrine of Once Saved Always Saved does so much damage. If a Christian could never fall away, then John wasted ink writing verse 16, James wasted ink in chapter 5, and the author of Hebrews was warning people about a danger that doesn’t exist. We’re working on a full study on that subject. Sign up so you’ll know when it’s released.
The moment a sinner turns back, the promise of 1 John 1:9 is standing right there waiting for him:
If we confess our sins, He is faithful and just to forgive us our sins and to cleanse us from all unrighteousness.
In the case of the person who is walking with Jesus and confessing his or her sins, it is just (it is the right course of action) for God to forgive those sins.
The passage we have been studying also tells us how to respond to a brother or sister who is walking away. John doesn’t say to stop caring about them. We can’t pray for God to forgive them while they refuse to repent, but we can go to them. Paul told Timothy:
A servant of the Lord must not quarrel but be gentle to all, able to teach, patient, in humility correcting those who are in opposition, if God perhaps will grant them repentance, so that they may know the truth, and that they may come to their senses and escape the snare of the devil, having been taken captive by him to do his will.
2 Timothy 2:24–26
Isn’t that amazing? Even for someone caught in the devil’s snare, there is still a way out. That is the kind of God we serve.
The sin unto death is not a trapdoor you fell through without knowing it. It is a road someone chooses to keep walking. If you are on that road today, you don’t have to stay there. Stop. Turn around. Confess your sins. If you’ve never obeyed the gospel, if you’ve never been buried with Christ in baptism for the forgiveness of your sins, don’t wait another day. If we could help you with that, please reach out to us. And if you are a Christian who has wandered, come home. Ask your brothers and sisters to pray for you. That is exactly the prayer John says God will answer.
Let’s return to that other question: Is the sin that leads to death the same as the eternal sin Jesus talks about in the gospel accounts—blasphemy of the Holy Spirit? The short answer is no. Jesus was addressing scribes who watched Him cast out demons by the Holy Spirit and claimed He had an unclean spirit. Nothing in 1 John points back to that event. John is writing to brothers in Christ, in a letter that promises cleansing from all unrighteousness. Those are two different discussions. But the eternal sin deserves a full study of its own, because there is a lot of confusion about it, and a lot of Christians are needlessly afraid they have committed it. Explore this question further with this study.