8 Bible Verses about Unforgivable Sin

"Therefore I tell you that every sin and blasphemy shall be forgiven men; but the blasphemy against the Holy Spirit shall not be forgiven. "And if any man say a word against the Son of man, it shall be forgiven him; but whoever speaks against the Holy Spirit, it shall not be forgiven him, either in this age or in that which is to come.

In solemn truth I tell you that the sons of men shall be forgiven all their sins and all the blasphemies they may utter, but he who blasphemes against the Holy Spirit is never forgiven. Nay, he is in the grasp of an eternal sin."

"If any one shall speak a word against the Son of man it shall be forgiven him; but he who is blasphemes against the Holy Spirit shall not be forgiven.

For if we sin wilfully, after we have received the knowledge of the truth, there no longer remains any other sacrifice for sins, but a certain fearful expectation of judgment, and a fiery indignation which is about to devour the adversaries. Any one who set at naught the law of Moses was put to death without pity, on the testimony of two or three witnesses.read more.
How much surer, think you, will be the punishment of one who has trodden under foot the Son of God, and has profaned that covenant blood with which he was sanctified, and has done despite to the spirit of grace?

Because they kept saying, "He has an unclean spirit."

When the Pharisees heard it they said, "It is only by the aid of Beelzebub, the Prince of the demons, that this fellow is driving out demons."

The Scribes also who had come down from Jerusalem, said, "He is Beelzebub," and, "He casts out demons by the power of the Prince of the demons."

But some of them said, "It is by Beelzebub, the prince of demons, that he cast out demons."