📖 Biblical Definition
The “sin unto death” is a phrase from the First Epistle of John denoting a sin so grave that the apostle distinguishes it from ordinary sins for which intercession is encouraged: “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.” The interpretation has divided godly readers, and several views are held with reverence. Some understand it as the sin of full apostasy—a deliberate, final, and total renunciation of Christ by those who had professed Him, akin to the falling away of Hebrews 6 and 10, for which no sacrifice remains. Others identify it with the blasphemy against the Holy Spirit, the unpardonable sin of which Christ spoke. Still others, noting that John speaks of a brother, take the “death” to be physical—a sin so serious that God removes the offender by temporal death as a chastisement, as with those at Corinth who died for profaning the Lord’s Table, or Ananias and Sapphira. What is clear amid the debate is that John is not forbidding prayer but declining to command it for this particular case, recognizing that some sins manifest a settled, impenitent rejection of God beyond the bounds of ordinary intercession. The pastoral comfort remains constant across the views: the very soul that fears it has committed such a sin, and longs for mercy, gives evidence it has not, for the sin unto death is marked by hardened impenitence, not by anxious longing for grace.
📜 Webster 1828 Definition
Webster 1828 treats SIN generally; the “sin unto death” is the grave sin of 1 John 5:16, variously understood as apostasy, the unpardonable sin, or a sin punished by temporal death.
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SIN, n. — The voluntary departure of a moral agent from a known rule of rectitude or duty, prescribed by God.
The “sin unto death” (1 John v. 16) denotes a transgression of such gravity that the apostle distinguishes it from sins for which intercession is enjoined; understood by divines as final apostasy, the blasphemy against the Spirit, or a sin visited with bodily death.
📖 Key Scripture
1 John 5:16 — "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."
1 John 5:17 — "All unrighteousness is sin: and there is a sin not unto death."
Hebrews 10:26-27 — "For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins, But a certain fearful looking for of judgment."
1 Corinthians 11:30 — "For this cause many are weak and sickly among you, and many sleep."
⚠️ Modern Corruption
No major postmodern redefinition; the danger is pastoral misuse—either tormenting tender consciences who fear they have committed it, or, oppositely, denying that any sin is so grave as to lie beyond ordinary intercession.
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The phrase “sin unto death” is more often mishandled pastorally than redefined doctrinally. On one side, it has been wielded to torment tender and anxious consciences—the grieving believer convinced that some grave fall has placed him beyond the reach of prayer and pardon, sinking into despair under a misapplication of John’s words. This is a cruel misuse, for the very anxiety that drives such a soul to seek mercy is itself the surest evidence that he has not committed the sin in question, which is marked by settled, hardened impenitence and an utter absence of longing for grace. The wounded conscience that cries for forgiveness has not crossed that line.
On the other side stands a sentimental refusal to admit that any sin could be so grave—an assumption that intercession will always avail and that no one is ever beyond the ordinary ministry of prayer. But John plainly distinguishes a sin for which he does not command prayer, and Scripture elsewhere speaks of apostasy beyond renewal, of blasphemy that shall not be forgiven, and of professing members removed by temporal death. The doctrine, soberly held, neither crushes the penitent nor flatters the presumptuous: it warns that sin pursued in hardened defiance can reach a point of no return, while assuring every troubled soul that hungers for Christ that the door of mercy stands open, for none who truly seek Him are cast out.
🔗 Greek & Hebrew Roots
The phrase is hamartia pros thanaton (a sin toward death), distinguished from the hamartia mē pros thanaton (sin not unto death) for which intercession is enjoined.
Usage
"John distinguishes a sin unto death for which he does not command prayer from sins not unto death."
"Divines read the sin unto death as final apostasy, the blasphemy against the Spirit, or a sin punished by bodily death."
"The soul that fears it has sinned unto death, and longs for mercy, proves by that longing it has not."