Matthew 12:31, 32
Therefore I tell you, every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven. . . .

Luke 12:10
And everyone who speaks a word against the Son of Man will be forgiven, but whoever blasphemes against the Holy Spirit will not be forgiven.

Hebrews 6:4-8
It is impossible for those who have once been enlightened, who have tasted the heavenly gift, who have shared in the Holy Spirit, . . .

Hebrews 10:26-31
If we deliberately go on sinning after we have received the knowledge of the truth, no further sacrifice for sins remains, . . .

1 John 5:16
If anyone sees his brother committing a sin not leading to death, he should ask God, who will give life to those who commit this kind of sin. There is a sin that leads to death; I am not saying he should ask regarding that sin.