Mark 3:28

Truly I say to you, all sins shall be forgiven the sons of men, and whatever blasphemies they utter;

Matthew 12:31-32

Therefore I say to you, any sin and blasphemy shall be forgiven people, but blasphemy against the Spirit shall not be forgiven.

Luke 12:10

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

1 John 5:16

If anyone sees his brother committing a sin not leading to death, he shall ask and God will for him give life to those who commit sin not leading to death. There is a sin leading to death; I do not say that he should make request for this.

Mark 3:28-30

Truly I say to you, all sins shall be forgiven the sons of men, and whatever blasphemies they utter;

Hebrews 6:4-8

For in the case of those who have once been enlightened and have tasted of the heavenly gift and have been made partakers of the Holy Spirit,

Hebrews 10:26-31

For if we go on sinning willfully after receiving the 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, any sin and blasphemy shall be forgiven people, but blasphemy against the Spirit shall not be forgiven.
Luke 12:10
And everyone who speaks a word against the Son of Man, it will be forgiven him; but he who blasphemes against the Holy Spirit, it will not be forgiven him.
Hebrews 6:4
For in the case of those who have once been enlightened and have tasted of the heavenly gift and have been made partakers of the Holy Spirit,
Hebrews 10:26
For if we go on sinning willfully 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 for him give life to those who commit sin not leading to death. There is a sin leading to death; I do not say that he should make request for this.