Mark 3:28

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

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.

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.

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.

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;

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,

Treasury of Scripture Knowledge

Summary

Verily I say unto you, All sins shall be forgiven unto the sons of men, and blasphemies wherewith soever they shall blaspheme:

Bible References

General references

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.
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,
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.