Matthew 12:31

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.

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.

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;

Acts 7:51

Ye stiffnecked, and uncircumcised in heart and ears! ye do always resist the Holy Spirit; as your fathers did, so do ye.

Hebrews 6:4

For as to those who were once enlightened, and tasted of the heavenly gift, and became partakers of the Holy Spirit,

Hebrews 10:26

For, if we sin wilfully after we received the full knowledge of the truth, there no longer remains a sacrifice for sins,

Hebrews 10:29

of how much worse punishment, think ye, shall he be accounted worthy, who trampled under foot the Son of God, and accounted the blood of the covenant with which He was sanctified an unholy thing, and treated with contempt the Spirit of grace?

1 John 1:9

If we confess our sins, He is faithful and righteous to forgive us our sins, and to cleanse us from all unrighteousness.

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.

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 Timothy 1:13-15

though formerly I was a blasphemer, and a persecutor, and injurious; but I obtained mercy, because I, being ignorant, did it in unbelief;

1 John 2:1-2

My little children, these things I write to you, that ye may not sin. And, if any one sin, we have an Advocate with the Father, Jesus Christ, the Righteous.

Treasury of Scripture Knowledge

Summary

Wherefore I say unto you, All manner of sin and blasphemy shall be forgiven unto men: but the blasphemy against the Holy Ghost shall not be forgiven unto men.

General references

Bible References

All

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;
Hebrews 6:4
For as to those who were once enlightened, and tasted of the heavenly gift, and became partakers of the Holy Spirit,
1 John 1:9
If we confess our sins, He is faithful and righteous to forgive us our sins, and to cleanse us from all unrighteousness.
1 John 2:1
My little children, these things I write to you, that ye may not sin. And, if any one sin, we have an Advocate with the Father, Jesus Christ, the Righteous.

But

Mark 3:28
Verily I say to you, all the sins will be forgiven the sons of men, and the blasphemies whatsoever they blaspheme;
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.
Acts 7:51
Ye stiffnecked, and uncircumcised in heart and ears! ye do always resist the Holy Spirit; as your fathers did, so do ye.
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.

General references

Mark 3:28
Verily I say to you, all the sins will be forgiven the sons of men, and the blasphemies whatsoever they blaspheme;
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.