8 Bible Verses about Unforgivable Sin

Therefore I say unto you, All manner of sin and blasphemy shall be forgiven unto men: but the blasphemy against the Holy Spirit shall not be forgiven unto men. And whosoever speaks a word against the Son of man, it shall be forgiven him: but whosoever speaks against the Holy Spirit, it shall not be forgiven him, neither in this world, nor in the world to come.

Verily I say unto you, All sins shall be forgiven unto the sons of men, and blasphemies whatever they shall blaspheme: But he that shall blaspheme against the Holy Spirit has never forgiveness, but is in danger of eternal judgment:

And whosoever shall speak a word against the Son of man, it shall be forgiven him: but unto him that blasphemes against the Holy Spirit it shall not be forgiven.

For if we sin willfully after we have received the knowledge of the truth, there remains no more sacrifice for sins, But a certain fearful expectation of judgment and fiery indignation, which shall devour the adversaries. He that despised Moses' law died without mercy under two or three witnesses:read more.
Of how much worse punishment, suppose you, shall he be thought worthy, who has trodden under foot the Son of God, and has counted the blood of the covenant, with which he was sanctified, an unholy thing, and has done insult unto the Spirit of grace?

Because they said, He has an unclean spirit.

But when the Pharisees heard it, they said, This fellow does not cast out demons, but by Beelzebub the prince of the demons.

And the scribes who came down from Jerusalem said, He has Beelzebub, and by the prince of the demons casts he out demons.

But some of them said, He casts out demons through Beelzebub the chief of the demons.