Luke 12:10

And everyone who speaks a word against the Son of Man will be forgiven, but the one who blasphemes against the Holy Spirit will not be forgiven.

Matthew 12:31-32

Therefore I tell you, every sin and blasphemy will be forgiven people, but the blasphemy against the Spirit will not be forgiven.

1 John 5:16

If anyone sees his brother committing a sin not leading to death, he shall ask, and God will give him life--to those who commit sins that do not lead to death. There is sin that leads to death; I do not say that one should pray for that.

1 Timothy 1:13

though formerly I was a blasphemer, persecutor, and insolent opponent. But I received mercy because I had acted ignorantly in unbelief,

Mark 3:28-30

"Truly, I say to you, all sins will be forgiven the children of man, and whatever blasphemies they utter,

Luke 23:34

And Jesus said, "Father, forgive them, for they know not what they do." And they cast lots to divide his garments.

Hebrews 6:4-8

For it is impossible, in the case of those who have once been enlightened, who have tasted the heavenly gift, and have shared in the Holy Spirit,

Hebrews 10:26-31

For if we go on sinning deliberately after receiving the knowledge of the truth, there no longer remains a sacrifice for sins,

Treasury of Scripture Knowledge

Summary

And whosoever shall speak a word against the Son of man, it shall be forgiven him: but unto him that blasphemeth against the Holy Ghost it shall not be forgiven.

Bible References

General references

Luke 23:34
And Jesus said, "Father, forgive them, for they know not what they do." And they cast lots to divide his garments.
Matthew 12:31
Therefore I tell you, every sin and blasphemy will be forgiven people, but the blasphemy against the Spirit will not be forgiven.
Mark 3:28
"Truly, I say to you, all sins will be forgiven the children of man, and whatever blasphemies they utter,
1 Timothy 1:13
though formerly I was a blasphemer, persecutor, and insolent opponent. But I received mercy because I had acted ignorantly in unbelief,
Hebrews 6:4
For it is impossible, in the case of those who have once been enlightened, who have tasted the heavenly gift, and have shared in the Holy Spirit,
Hebrews 10:26
For if we go on sinning deliberately after receiving the knowledge of the truth, there no longer remains a sacrifice for sins,
1 John 5:16
If anyone sees his brother committing a sin not leading to death, he shall ask, and God will give him life--to those who commit sins that do not lead to death. There is sin that leads to death; I do not say that one should pray for that.

The Holy Bible, English Standard Version® copyright © 2001 by Crossway Bibles, a publishing ministry of Good News Publishers.