Bible Verses About Unpardonable Sin: General references

And for the innocent blood that he shed, filling Jerusalem with innocent blood: and therefore the Lord would not be appeased.

Therefore I say to you: Every sin and blasphemy shall be forgiven men, but the blasphemy of the Spirit shall not be forgiven.

And whosoever shall speak a word against the Son of man, it shall be forgiven him: but he that shall speak against the Holy Ghost, it shall not be forgiven him neither in this world, nor in the world to come.

And whosoever speaketh a word against the Son of man, it shall be forgiven him: but to him that shall blaspheme against the Holy Ghost, it shall not be forgiven.

For it is impossible for those who were once illuminated, have tasted also the heavenly gift and were made partakers of the Holy Ghost,

Have moreover tasted the good word of God and the powers of the world to come,

And are fallen away: to be renewed again to penance, crucifying again to themselves the Son of God and making him a mockery.

He that knoweth his brother to sin a sin which is not to death, let him ask: and life shall be given to him who sinneth not to death. There is a sin unto death. For that I say not that any man ask.