8 Bible Verses about Unforgivable Sin

Wherefore I say unto you, All manner of sin and blasphemy shall be forgiven unto men, but the blasphemy of the spirit shall not be forgiven unto men. And whosoever speaketh a word against the son of man, it shall be forgiven him: but whosoever speaketh against the holy ghost, it shall not be forgiven him: no, neither in this world, neither in the world to come.

Verily I say unto you, All sins shall be forgiven unto men's children: and blasphemy, wherewith they blaspheme: but he that blasphemeth the holy ghost shall never have forgiveness: but is in danger of eternal damnation."

And whosoever speaketh a word against the son of man, it shall be forgiven him. But unto him that blasphemeth the holy ghost, it shall not be forgiven.

For if we sin willingly after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins: but a fearful looking for judgment, and violent fire, which shall devour the adversaries. He that despiseth Moses' law, dieth without mercy under two or three witnesses.read more.
Of how much sorer punishment, suppose ye, shall he be counted worthy, which treadeth underfoot the son of God: and counteth the blood of the testament as an unholy thing, wherewith he was sanctified, and doth dishonour to the spirit of grace.

Because they said, "He had an unclean spirit."

But when the Pharisees heard that, they said, "This fellow driveth the devils no other wise out, but by the help of Beelzebub the chief of the devils."

And the scribes, which came from Jerusalem, said, "He hath Beelzebub, and by the power of the chief devil, casteth out devils."

But some of them said, "He casteth out devils by the power of Beelzebub, the chief of the devils."