Mark 3:29

but whoever blasphemes against the Holy Spirit, he remains for ever unabsolved: he is guilty of a sin of the Ages."

Matthew 25:46

"And these shall go away into the Punishment of the Ages, but the righteous into the Life of the Ages."

Mark 12:40

and who swallow up the property of widows and then mask their wickedness by making long prayers: these men will receive far heavier punishment."

Luke 12:10

"Moreover every one who shall speak against the Son of Man, may obtain forgiveness; but he who blasphemes the Holy Spirit will never obtain forgiveness.

Matthew 12:31-32

This is why I tell you that men may find forgiveness for every other sin and impious word, but that for impious speaking against the Holy Spirit they shall find no forgiveness.

2 Thessalonians 1:9

They will pay the penalty of eternal destruction, being banished from the presence of the Lord and from His glorious majesty,

Jude 1:7

So also Sodom and Gomorrah--and the neighboring towns in the same manner--having been guilty of gross fornication and having gone astray in pursuit of unnatural vice, are now before us as a specimen of the fire of the Ages in the punishment which they are undergoing.

Jude 1:13

wild waves of the sea, foaming out their own shame; wandering stars, for whom is reserved dense darkness of age-long duration.

Treasury of Scripture Knowledge

Summary

But he that shall blaspheme against the Holy Ghost hath never forgiveness, but is in danger of eternal damnation:

General references

Bible References

But is

Mark 12:40
and who swallow up the property of widows and then mask their wickedness by making long prayers: these men will receive far heavier punishment."
Matthew 25:46
"And these shall go away into the Punishment of the Ages, but the righteous into the Life of the Ages."
2 Thessalonians 1:9
They will pay the penalty of eternal destruction, being banished from the presence of the Lord and from His glorious majesty,
Jude 1:7
So also Sodom and Gomorrah--and the neighboring towns in the same manner--having been guilty of gross fornication and having gone astray in pursuit of unnatural vice, are now before us as a specimen of the fire of the Ages in the punishment which they are undergoing.

General references

Luke 12:10
"Moreover every one who shall speak against the Son of Man, may obtain forgiveness; but he who blasphemes the Holy Spirit will never obtain forgiveness.