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What is the unforgivable sin, the blasphemy against the Holy Spirit that Jesus spoke of?

Direct

A clear verse states this directly, and no higher-or-equal-authority text overturns it.

Jesus directly identifies the unforgivable sin as blasphemy against the Holy Spirit, specifically, the act of attributing the Spirit's work to Satan, and declares it will not be forgiven in this age or the age to come.

Jesus' own words in Matthew 12:31-32, Mark 3:28-29, and Luke 12:10 state plainly that every sin and blasphemy will be forgiven, but blasphemy against the Holy Spirit will not, and Mark 3:30 explicitly identifies the act that prompted the warning: calling the Spirit of God an unclean spirit.

Key texts:
Matthew 12:28Tier 2 · Jesus
“But if I by the Spirit of God cast out demons, then God’s Kingdom has come upon you.”
Matthew 12:31Tier 2 · Jesus
“Therefore I tell you, every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven men.”
Matthew 12:32Tier 2 · Jesus
“Whoever speaks a word against the Son of Man, it will be forgiven him; but whoever speaks against the Holy Spirit, it will not be forgiven him, either in this age, or in that which is to come.”

…and 14 more verses weighed in the full analysis.

This is a summary.

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