Mark 3:29

but whoever blasphemes against the Holy Spirit shall never have forgiveness, but is the subject of an eternal mistake;

Matthew 25:46

And these shall go away into eternal punishment, but the righteous into life eternal.

Mark 12:40

who devour widows' houses, and for a pretence make long prayers. They shall receive a greater judgment.

Luke 12:10

And every one that speaks a word against the Son of man shall have forgiveness; but he that blasphemes against the Holy Spirit shall not be forgiven.

Matthew 12:31-32

Therefore, I tell you, every sin and blasphemy shall be forgiven men, but the blasphemy of the Spirit shall not be forgiven men.

2 Thessalonians 1:9

who shall suffer the punishment of eternal destruction from the presence of the Lord and from the glory of his power,

Jude 1:7

as Sodom and Gomorrah and the cities about them, committing fornication in the same manner as these and going after unnatural lewdness, are made an example, enduring the punishment of eternal fire.

Jude 1:13

wild waves of the sea foaming with their own shame, wandering stars to which is reserved the blackness of darkness for ever.

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
who devour widows' houses, and for a pretence make long prayers. They shall receive a greater judgment.
Matthew 25:46
And these shall go away into eternal punishment, but the righteous into life eternal.
2 Thessalonians 1:9
who shall suffer the punishment of eternal destruction from the presence of the Lord and from the glory of his power,
Jude 1:7
as Sodom and Gomorrah and the cities about them, committing fornication in the same manner as these and going after unnatural lewdness, are made an example, enduring the punishment of eternal fire.

General references

Luke 12:10
And every one that speaks a word against the Son of man shall have forgiveness; but he that blasphemes against the Holy Spirit shall not be forgiven.