Luke 12:10
Everyone who speaks a word against the Son of Man will be forgiven, but those who blaspheme against the Holy Spirit will not be forgiven.
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 men.
1 John 5:16
If anyone sees his brother sinning a sin not leading to death, he shall ask, and God will give him life for those who sin not leading to death. There is a sin leading to death. I don't say that he should make a request concerning this.
1 Timothy 1:13
although I was before a blasphemer, a persecutor, and insolent. However, I obtained mercy, because I did it ignorantly in unbelief.
Mark 3:28-30
Most certainly I tell you, all sins of the descendants of man will be forgiven, including their blasphemies with which they may blaspheme;
Luke 23:34
Jesus said, "Father, forgive them, for they don't know what they are doing." Dividing his garments among them, they cast lots.
Hebrews 6:4-8
For concerning those who were once enlightened and tasted of the heavenly gift, and were made partakers of the Holy Spirit,
Hebrews 10:26-31
For if we sin willfully after we have received the knowledge of the truth, there remains no more a sacrifice for sins,