Mark 3:28

Verily I say unto you, that all sins shall be forgiven to the sons of men, and all the injurious speeches with which they may speak injuriously;

Matthew 12:31-32

For this reason I say unto you, Every sin and injurious speaking shall be forgiven to men, but speaking injuriously of the Spirit shall not be forgiven to men.

Luke 12:10

and whoever shall say a word against the Son of man it shall be forgiven him; but to him that speaks injuriously against the Holy Spirit it shall not be forgiven.

1 John 5:16

If any one see his brother sinning a sin not unto death, he shall ask, and he shall give him life, for those that do not sin unto death. There is a sin to death: I do not say of that that he should make a request.

Mark 3:28-30

Verily I say unto you, that all sins shall be forgiven to the sons of men, and all the injurious speeches with which they may speak injuriously;

Hebrews 6:4-8

For it is impossible to renew again to repentance those once enlightened, and who have tasted of the heavenly gift, and have been made partakers of the Holy Spirit,

Hebrews 10:26-31

For where we sin wilfully after receiving the knowledge of the truth, there no longer remains any 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
For this reason I say unto you, Every sin and injurious speaking shall be forgiven to men, but speaking injuriously of the Spirit shall not be forgiven to men.
Luke 12:10
and whoever shall say a word against the Son of man it shall be forgiven him; but to him that speaks injuriously against the Holy Spirit it shall not be forgiven.
Hebrews 6:4
For it is impossible to renew again to repentance those once enlightened, and who have tasted of the heavenly gift, and have been made partakers of the Holy Spirit,
Hebrews 10:26
For where we sin wilfully after receiving the knowledge of the truth, there no longer remains any sacrifice for sins,
1 John 5:16
If any one see his brother sinning a sin not unto death, he shall ask, and he shall give him life, for those that do not sin unto death. There is a sin to death: I do not say of that that he should make a request.