Luke 12:10
And every one who shall say a word against the Son of Man, it shall be forgiven him; but to him who blasphemes against the Holy Spirit, it shall not be forgiven.
Matthew 12:31-32
Therefore, I say to you, every sin and blasphemy will be forgiven to men, but the blasphemy against the Holy Spirit shall not be forgiven.
1 John 5:16
If anyone sees his brother sinning a sin not to death, he shall ask, and God will give him life for those that sin not to death. There is a sin to death: I do not say that he shall make request concerning this.
1 Timothy 1:13
though formerly I was a blasphemer, and a persecutor, and injurious; but I obtained mercy, because I, being ignorant, did it in unbelief;
Mark 3:28-30
Verily I say to you, all the sins will be forgiven the sons of men, and the blasphemies whatsoever they blaspheme;
Luke 23:34
And Jesus said, "Father, forgive them; for they know not what they do!" And, dividing His garments among them, they cast lots.
Hebrews 6:4-8
For as to those who were once enlightened, and tasted of the heavenly gift, and became partakers of the Holy Spirit,
Hebrews 10:26-31
For, if we sin wilfully after we received the full knowledge of the truth, there no longer remains a sacrifice for sins,