762. asbestos
Lexical Summary
asbestos: Unquenchable, inextinguishable

Original Word: ἄσβεστος
Part of Speech: Adjective
Transliteration: asbestos
Pronunciation: as'-bes-tos
Phonetic Spelling: (as'-bes-tos)
KJV: not to be quenched, unquenchable
NASB: unquenchable
Word Origin: [from G1 (α - Alpha) (as a negative particle) and a derivative of G4570 (σβέννυμι - quenched)]

1. not extinguished
2. (by implication) perpetual

Strong's Exhaustive Concordance
unquenchable.

From a (as a negative particle) and a derivative of sbennumi; not extinguished, i.e. (by implication) perpetual -- not to be quenched, unquenchable.

see GREEK a

see GREEK sbennumi

NAS Exhaustive Concordance
Word Origin
from alpha (as a neg. prefix) and sbestos (quenched, extinguished)
Definition
unquenched, unquenchable
NASB Translation
unquenchable (3).

Thayer's Greek Lexicon
STRONGS NT 762: ἄσβεστος

ἄσβεστος, ἄσβεστον (σβέννυμι), unquenched (Ovid,inexstinctus), unquenchable (Vulg.inexstinguibilis): πῦρ, Matthew 3:12; Luke 3:17; Mark 9:43, and R G L brackets in 45. (Often in Homer; πῦρ ἄσβεστος of the perpetual fire of Vesta, Dionysius Halicarnassus, Antiquities 1, 76; (of the fire on the altar, Philo de ebriet. § 34 (Mang. i. 378); de vict. off. § 5 (Mang. 2:254); of the fire of the magi, Strabo 15 (3) 15; see also Plutarch, symp. 50:7, probl. 4; Aelian nat. an. 5, 3; cf. Heinichen on Eusebius, h. e. 6, 41, 15).)

Topical Lexicon
Overview

Strong’s Greek 762 (ἄσβεστος) portrays a fire that no human action can extinguish. The word is reserved in the New Testament for the judgment imagery of John the Baptist and of Jesus Himself, where it functions as a solemn warning that divine retribution is irrevocable and everlasting.

Biblical Usage

1. Matthew 3:12; Luke 3:17 – John the Baptist warns that the Messiah “will burn up the chaff with unquenchable fire.” The metaphor pictures the final sorting at harvest time: the repentant are likened to wheat safely stored, while the unrepentant chaff is consigned to a blaze that nothing can put out.
2. Mark 9:43; Mark 9:45 – Jesus heightens the warning, urging radical self-denial rather than risk “the unquenchable fire.” The setting is Gehenna, a place already associated with continual burning refuse outside Jerusalem. By attaching ἄσβεστος to Gehenna, Jesus declares that the judgment awaiting the unrepentant surpasses any temporal fire.

Old Testament Background

Prophets repeatedly speak of a flame no one can quench (Isaiah 66:24; Jeremiah 17:27; Ezekiel 20:47; Isaiah 34:10). Those texts provide linguistic and theological soil for New Testament usage: God’s wrath burns until its purpose is accomplished, and no earthly power can extinguish it.

Theological Significance

• Finality of Judgment – ἄσβεστος denotes not merely a long-lasting blaze but one immune to all attempts at extinction (contrast Isaiah 1:31 where man’s fire “cannot be quenched” because God sustains it). The term therefore undercuts notions of a reversible or temporary punishment.
• Divine Agency – In both John’s and Jesus’ preaching, God is the One who lights and maintains the fire. Human beings neither start it nor stop it.
• Moral Seriousness – The warning stands alongside offers of mercy. Grace reaches its fullest urgency when judgment is understood as permanent.

Historical and Cultural Insights

In classical literature ἄσβεστος described lamps kept perpetually burning in temples or a forge that never cooled. Jewish writers applied similar language to the fires that consumed idolatrous cities (e.g., Jubilees 36:10). By the first century, the Valley of Hinnom (Gehenna) had become a ready symbol of such destruction. Jesus taps into this cultural memory yet lifts it to an eschatological horizon: Gehenna’s flames are not a municipal dump but a preview of eternal destiny.

Representative Berean Standard Bible Quotations

Matthew 3:12 – “His winnowing fork is in His hand, and He will clear His threshing floor and gather His wheat into the barn, but He will burn up the chaff with unquenchable fire.”

Mark 9:43 – “If your hand causes you to stumble, cut it off. It is better for you to enter life maimed than to have two hands and go into hell, into the unquenchable fire.”

Doctrinal Connections

• Eternal Punishment (Revelation 20:10, 14-15) – While ἄσβεστος itself is not used in Revelation, the vision of the lake of fire parallels the concept: the flame continues “forever and ever.”
• Holiness and Discipleship (Romans 12:1; 1 Peter 1:16) – The radical surgery language of Mark 9 shows that holiness is worth any earthly cost, for the alternative is an irreversible fate.
• Gospel Urgency (Acts 17:30-31) – John’s threshing floor image drives evangelistic proclamation: repentance is the only escape from the coming fire.

Patristic Reception

Early church fathers such as Ignatius (Letter to the Ephesians 16) and Polycarp (Philippians 2) echoed the vocabulary of “unquenchable fire” when warning wayward believers. Their consistency with New Testament usage illustrates the early church’s grasp of eternal conscious punishment.

Ministerial Application

• Preaching – ἄσβεστος keeps sermons from reducing divine judgment to metaphor; it insists on a real, enduring consequence of sin.
• Pastoral Care – For the penitent, the term underscores the greatness of salvation: Christ saves from a fate no human can avert.
• Discipleship – Mark 9 turns the word into a motivation for rigorous personal holiness; believers are urged to remove stumbling blocks swiftly and decisively.

Summary

ἄσβεστος stands as a four-fold New Testament beacon declaring that God’s final judgment is certain, irreversible, and eternal. The word’s vividness compels every hearer either to embrace the Messiah who gathers the wheat or to face the fire that will never be quenched.

Forms and Transliterations
ασβεστον άσβεστον ἄσβεστον ασβεστω ασβέστω ἀσβέστῳ ασβόλην asbesto asbestō asbéstoi asbéstōi asbeston ásbeston
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Englishman's Concordance
Matthew 3:12 Adj-DNS
GRK: κατακαύσει πυρὶ ἀσβέστῳ
NAS: up the chaff with unquenchable fire.
KJV: the chaff with unquenchable fire.
INT: he will burn up with fire unquenchable

Mark 9:43 Adj-ANS
GRK: πῦρ τὸ ἄσβεστον
NAS: into hell, into the unquenchable fire,
KJV: the fire that never shall be quenched:
INT: fire unquenchable

Mark 9:45 Adj-ANS
GRK: πῦρ τὸ ἄσβεστον
KJV: the fire that never shall be quenched:
INT: fire unquenchable

Luke 3:17 Adj-DNS
GRK: κατακαύσει πυρὶ ἀσβέστῳ
NAS: up the chaff with unquenchable fire.
KJV: he will burn with fire unquenchable.
INT: he will burn with fire unquenchable

Strong's Greek 762
4 Occurrences


ἀσβέστῳ — 2 Occ.
ἄσβεστον — 2 Occ.

761
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