Luke 12:10
And whosoever shall speak a word against the Son of man, there is forgiveness for him; but unto him that blasphemes against the Holy Spirit, it shall not be forgiven.
Matthew 12:31-32
Therefore I say unto you, All manner of sin and blasphemy shall be forgiven unto men, but the blasphemy against the Spirit shall not be forgiven unto men.
1 John 5:16
If any man see his brother sin a sin which is not unto death, he shall ask God, and he shall give him life that is, unto those that do not sin unto death. There is sin unto death, for which I do not say that you should pray.
1 Timothy 1:13
who was before a blasphemer and a persecutor and injurious, but I was received unto mercy because I did it ignorantly in unbelief.
Mark 3:28-30
Verily I say unto you, All sins shall be forgiven unto the sons of men and whatever blasphemies with which they shall blaspheme,
Luke 23:34
Then Jesus said, Father, forgive them; for they know not what they do. And they parted his raiment and cast lots.
Hebrews 6:4-8
For it is impossible that those who once received the light and tasted of that heavenly gift and were made partakers of the Holy Spirit
Hebrews 10:26-31
For if we sin wilfully after we have received the knowledge of the truth, there remains no more sacrifice for sins,