Hebrews 10:26
For if we sin deliberately after we have received the knowledge of the truth, there no longer remains a sacrifice for sins,
Matthew 12:32
Anyone who speaks a word against the Son of Man will be forgiven; but whoever speaks against the Holy Spirit will not be forgiven, either in this age or in the age to come.
Hebrews 10:29
How much severer punishment do you think a man will deserve who has trampled under foot the Son of God, and has regarded as an unclean thing the blood of the covenant by which he was sanctified, and has insulted the Spirit of grace?
2 Peter 2:10
and especially those who indulge the flesh in its corrupt desire and despise authority. Bold and willful, they are not afraid to revile the glorious ones,