Blasphemy is speech or action that dishonors the character, name, or work of God — attributing evil to Him, denying His attributes, or treating the holy as common. In the Old Testament, blasphemy was a capital offense (Lev 24:16) because words against God are an assault on ultimate reality itself. Jesus was accused of blasphemy for claiming to be God (John 10:33) — an accusation that would have been correct had He not actually been God. The gravest form is "blasphemy against the Holy Spirit" (Matt 12:31-32), which most theologians interpret as the persistent, hardened attribution of the Spirit's work to Satan — the settled refusal to acknowledge God's truth. Blasphemy is the opposite of worship: worship ascribes worth to God; blasphemy denies it.
BLASPHEMY, n. An indignity offered to God by words or writing; reproachful, contemptuous or irreverent words uttered impiously against Jehovah. Blasphemy is an injury offered to God, by denying that which is due and belonging to him, or attributing to him that which is not agreeable to his nature.
Contemporary culture has severed blasphemy from its theological moorings. The concept survives only as a social category — "blasphemy" now means offending someone's values or identity. Ironically, the very culture that abolished blasphemy laws has created new blasphemies: questioning progressive dogmas about gender or race is treated with the same social fury once reserved for sacrilege. Meanwhile, actual blasphemy against the God of Scripture is celebrated as free expression. The disappearance of the category reflects the deeper collapse: a culture that no longer believes in a holy God cannot understand why words against Him would matter.
Leviticus 24:16 — "Whoever blasphemes the name of the LORD shall surely be put to death."
Matthew 12:31–32 — "Every sin and blasphemy will be forgiven… but blasphemy against the Spirit will not be forgiven."
Mark 14:64 — The Sanhedrin charges Jesus with blasphemy for claiming to be the Son of God.
1 Timothy 1:13 — Paul calls himself "a blasphemer" before his conversion — and receives mercy through ignorance and unbelief.
Revelation 13:6 — The beast "opened its mouth to utter blasphemies against God, blaspheming his name and his dwelling."
G988 — βλασφημία (blasphēmia): slander, detraction, speech injurious to another's reputation; specifically impious speech against God. The verb blasphēmeō (G987) appears throughout the Gospels and Epistles.
H5006 — נָאַץ (nāʾats): to spurn, treat with contempt, despise; used of Israel despising God in the wilderness (Num 14:11) and of contempt for God's Word (2 Sam 12:14).
"The seriousness of blasphemy is directly proportional to the greatness of the One dishonored — which is why Scripture treats it as the gravest of offenses."
"False teaching that misrepresents God's character is a form of blasphemy — it constructs a god who is not the God of Scripture and leads people to worship an idol."
"Paul's testimony in 1 Timothy shows that even a blasphemer can receive mercy — the gospel reaches the worst offenders."