What is the Sin Unto Death in 1 John 5:16-17?
Question 7009
Near the end of his first epistle, the apostle John writes something that has puzzled believers for centuries: “If anyone sees his brother committing a sin not leading to death, he shall ask, and God will give him life—to those who commit sins that do not lead to death. There is sin that leads to death; I do not say that one should pray for that. All wrongdoing is sin, but there is sin that does not lead to death” (1 John 5:16-17). What is this mysterious “sin unto death”? And why does John seem to discourage prayer for those who commit it?
The Context of 1 John
To understand this passage, we need to grasp the context of the letter. John wrote to combat false teachers who had left the church and were promoting a proto-Gnostic heresy. These teachers denied the incarnation—that Jesus had come in the flesh (1 John 4:2-3). They claimed special spiritual knowledge while living in moral darkness (1:6; 2:4). They had been part of the Christian community but “went out from us” because “they were not of us” (2:19).
Throughout the letter, John draws sharp contrasts: light and darkness, truth and lies, love and hatred, life and death, those who are of God and those who are of the devil. He provides tests by which genuine believers can have assurance of salvation: the doctrinal test (believing that Jesus is the Christ come in the flesh), the moral test (practicing righteousness), and the social test (loving the brothers).
The immediate context of our passage is prayer. John has just assured his readers that God hears and answers prayer offered according to His will (5:14-15). This naturally raises a question: should we pray for fellow believers who are sinning? John answers yes—with one exception.
What Kind of Death?
The first question is whether “death” here refers to physical death or spiritual death (eternal separation from God). The Greek phrase is ἁμαρτία πρὸς θάνατον (hamartia pros thanaton), literally “sin toward death” or “sin unto death.” The word θάνατος (thanatos) can refer to either physical or spiritual death, and interpreters have taken both positions.
Some scholars understand this as physical death—God’s temporal judgment on persistent sin. There are biblical precedents for this. Ananias and Sapphira died for lying to the Holy Spirit (Acts 5:1-11). Some Corinthians became sick and even died because of their abuse of the Lord’s Supper: “That is why many of you are weak and ill, and some have died” (1 Corinthians 11:30). Paul mentions handing someone over to Satan “for the destruction of the flesh” (1 Corinthians 5:5). Charles Ryrie comments: “This is discipline that may even result in the premature physical death of the believer” (Basic Theology, p. 389).
Others understand death here as spiritual death—the eternal consequence of final unbelief. On this view, the sin unto death is not committed by true believers but by apostates who have departed from the faith, like the false teachers John has been combating. Zane Hodges takes this position in the Bible Knowledge Commentary: “The sin unto death is the sin of unbelief, particularly as seen in the departure of the false teachers from the Christian community.”
The Nature of This Sin
Several observations help clarify what John has in mind. First, John speaks of seeing a “brother” committing sin not unto death—and for such a person, prayer is appropriate. The term “brother” (ἀδελφός, adelphos) throughout John’s letter refers to fellow believers. When John speaks of sin unto death, he may be moving outside this category to those who were never truly brothers.
Second, John does not forbid prayer for those sinning unto death; he simply says he does not command it (“I do not say that one should pray for that”). This suggests uncertainty about such cases—perhaps because it is not always clear whether someone has crossed a line beyond which prayer is ineffective.
Third, the context of 1 John involves the departure of false teachers who denied Jesus’ incarnation. In 2:19, John wrote: “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 it might become plain that they all are not of us.” These individuals had been part of the community, seemed to be believers, but showed their true colours by abandoning the faith.
Two Main Interpretations
The first major view understands the sin unto death as apostasy—the complete and final rejection of Jesus by someone who has been exposed to the truth. These are not genuine believers losing salvation but false professors revealing their true nature. On this view, the “death” is spiritual and eternal. J. Dwight Pentecost writes: “This sin is the ultimate rejection of Christ, as demonstrated by the false teachers who denied the incarnation and left the fellowship. Prayer cannot avail for those who have decisively turned from the light” (The Joy of Living, p. 156).
A second view understands the sin unto death as persistent, unrepentant sin by a genuine believer that results in God taking their physical life. This is divine discipline at its most severe, as seen with the Corinthians and possibly Ananias and Sapphira (though their status as believers is debated). On this view, the believer is saved but dies prematurely. John Walvoord writes: “God reserves the right to take the life of a believer who persists in flagrant sin, as a form of ultimate discipline” (The Holy Spirit, p. 204).
A third view combines elements of both: the sin unto death could refer to different things in different cases—either the physical death of a believer under discipline or the spiritual death of an apostate. This explains why John does not command prayer for such cases: we may not know which situation we are dealing with.
Why Not Command Prayer?
John’s reluctance to command prayer for those sinning unto death is not a prohibition but a recognition that some situations lie outside the normal pattern of intercessory prayer. If someone has committed apostasy—completely and finally rejected Jesus after full exposure to the truth—no amount of prayer can restore them because they have rejected the only means of salvation. If God has determined to discipline a believer with physical death, our prayers cannot override His sovereign purpose.
This does not mean we should stop praying for wayward people. We often cannot know whether someone has crossed an irreversible line. John’s point is that we should not be troubled if our prayers seem ineffective in certain extreme cases—God may be doing something beyond our understanding. Lewis Sperry Chafer wisely counsels: “Believers should pray earnestly for sinning brethren, leaving the outcome to God who alone knows the state of their hearts” (Systematic Theology, Vol. 7, p. 143).
All Wrongdoing Is Sin
John adds in verse 17: “All wrongdoing is sin, but there is sin that does not lead to death.” This clarification serves two purposes. It reminds us that all sin is serious—we should never minimise any departure from God’s will. But it also offers reassurance: most sin, though serious, does not fall into the category of sin unto death. When a brother sins and we pray for him, God promises to give life—restoration, renewal, and spiritual vitality. Our prayers have power. Most sins can be confessed, forgiven, and overcome.
Conclusion
If you are a believer and fear you have committed the sin unto death, the very fact that you care indicates you have not. Those who commit apostasy have no spiritual concern—they have hardened themselves against God. Your concern for your soul is evidence that the Spirit is still at work in you.
For believers who are wandering, this passage is a sobering warning. God takes sin seriously. Though our salvation is secure, persistent rebellion can lead to serious discipline, even premature death. We should walk in the fear of the Lord, not presuming on His grace.
For those watching friends or family members turn away from the faith, continue to pray—but with humility and submission to God’s will. We cannot always know the state of another person’s heart or what God is doing in their lives. Pray, witness, love—and trust the outcome to God.
The overall message of 1 John is assurance, not anxiety. John writes so that those who believe may “know that you have eternal life” (5:13). The mention of sin unto death is a realistic acknowledgment that some will fall away—but these are those who “were not of us” (2:19). True believers, though they sin (1:8-10), have an Advocate with the Father, Jesus the righteous, who is the propitiation for their sins (2:1-2). Our sins are forgiven, our standing is secure, and our future is certain—not because of our performance but because of Jesus’ finished work.
“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
Bibliography
- Chafer, Lewis Sperry. Systematic Theology. Vol. 7. Dallas Seminary Press, 1948.
- Hodges, Zane C. The Epistles of John. Grace Evangelical Society, 1999.
- Pentecost, J. Dwight. The Joy of Living. Kregel Publications, 1996.
- Ryrie, Charles C. Basic Theology. Moody Press, 1999.
- Stott, John R. W. The Letters of John. Tyndale New Testament Commentaries. Eerdmans, 1988.
- Walvoord, John F. The Holy Spirit. Zondervan, 1991.
