8 Bible Verses about Unforgivable Sin

Therefore I say unto you, every sin and blasphemy shall be forgiven unto men; but the blasphemy of the Spirit shall not be forgiven unto men. And whosoever shall speak a word against the Son of man, it shall be forgiven unto him: but whosoever may speak against the Holy Spirit, it shall not be forgiven unto him, either in this age, or that which is to come.

Truly I say unto you, that all sins shall be forgiven unto the sons of men, and blasphemies whatsoever they may blaspheme: but whosoever may blaspheme against the Holy Ghost hath never forgiveness, but is subject of eternal condemnation.

And every one who shall speak a word against the Son of man, it shall be forgiven him: but to him having blasphemed against the Holy Ghost, it shall not be forgiven.

For we sinning willingly after we have received the perfect knowledge of the truth, there is left no more sacrifice for sins, but a certain fearful anticipation of judgment and violence of fire, about to devour the adversaries. The one having rejected the law of Moses dies without mercy before two or three witnesses:read more.
of how much more terrible punishment, do you think, the one having trodden under foot the Son of God, and counted the blood of the covenant, by which he was sanctified, common, and insulted the Spirit of grace; be counted worthy!

Because they were saying, He has an unclean spirit.

And the Pharisees hearing, said, This man casts not out demons, except through Beelzebul the prince of the demons.

And the scribes having come down from Jerusalem were saving, He has Beelzebul and He is casting out the demons through the prince of the demons.

And certain ones of them said, He casts out the demon through Beelzebul, the prince of the demons.