Matthew 12:31

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

Luke 12:10

And whosoever speaketh a word against the son of man, it shall be forgiven him. But unto him that blasphemeth the holy ghost, it shall not be forgiven.

Mark 3:28-30

Verily I say unto you, All sins shall be forgiven unto men's children: and blasphemy, wherewith they blaspheme:

Isaiah 1:18

And so though your sins be like to purple, they shall be made as white as snow; and though they be as red as scarlet, they shall be made like white wool.

Acts 7:51

"Ye stiffnecked and of uncircumcised hearts and ears: ye have always resisted the holy ghost: as your fathers did, so do ye.

Hebrews 6:4

For it is not possible that they which were once lighted, and have tasted of the heavenly gift, and were become partakers of the holy ghost,

Hebrews 10:26

For if we sin willingly after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins:

Hebrews 10:29

Of how much sorer punishment, suppose ye, shall he be counted worthy, which treadeth underfoot the son of God: and counteth the blood of the testament as an unholy thing, wherewith he was sanctified, and doth dishonour to the spirit of grace.

1 John 1:9

If we knowledge our sins, he is faithful and just, to forgive us our sins, and to cleanse us from all unrighteousness.

1 John 5:16

If any man see his brother sin a sin that is not to death, let him ask, and he shall give him life for them that sin not unto death. There is a sin unto death, for which say I not that a man should pray.

Isaiah 55:7

Let the ungodly man forsake his ways and the unrighteous his imaginations, and turn again unto the LORD: so shall he be merciful unto him; and to our God, for he is ready to forgive.

Ezekiel 33:11

Tell them, 'As truly as I live, sayeth the LORD God, I have no pleasure in the death of the wicked, but much rather that the wicked turn from his way and live. Turn you, turn you from your ungodly ways, O ye of the house of Israel. Oh, wherefore will ye die?'

Matthew 12:31-32

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

1 Timothy 1:13-15

when before I was a blasphemer, and a persecutor, and a tyrant. But I obtained mercy because I did it ignorantly, through unbelief:

1 John 2:1-2

My little children, these things write I unto you, that ye should sin not: if, though, any man sin, yet we have an Advocate with the father, even Jesus Christ, which is 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

Isaiah 1:18
And so though your sins be like to purple, they shall be made as white as snow; and though they be as red as scarlet, they shall be made like white wool.
Isaiah 55:7
Let the ungodly man forsake his ways and the unrighteous his imaginations, and turn again unto the LORD: so shall he be merciful unto him; and to our God, for he is ready to forgive.
Ezekiel 33:11
Tell them, 'As truly as I live, sayeth the LORD God, I have no pleasure in the death of the wicked, but much rather that the wicked turn from his way and live. Turn you, turn you from your ungodly ways, O ye of the house of Israel. Oh, wherefore will ye die?'
1 Timothy 1:13
when before I was a blasphemer, and a persecutor, and a tyrant. But I obtained mercy because I did it ignorantly, through unbelief:
Hebrews 6:4
For it is not possible that they which were once lighted, and have tasted of the heavenly gift, and were become partakers of the holy ghost,
1 John 1:9
If we knowledge our sins, he is faithful and just, to forgive us our sins, and to cleanse us from all unrighteousness.
1 John 2:1
My little children, these things write I unto you, that ye should sin not: if, though, any man sin, yet we have an Advocate with the father, even Jesus Christ, which is righteous.

But

Mark 3:28
Verily I say unto you, All sins shall be forgiven unto men's children: and blasphemy, wherewith they blaspheme:
Luke 12:10
And whosoever speaketh a word against the son of man, it shall be forgiven him. But unto him that blasphemeth the holy ghost, it shall not be forgiven.
Acts 7:51
"Ye stiffnecked and of uncircumcised hearts and ears: ye have always resisted the holy ghost: as your fathers did, so do ye.
1 John 5:16
If any man see his brother sin a sin that is not to death, let him ask, and he shall give him life for them that sin not unto death. There is a sin unto death, for which say I not that a man should pray.

General references

Mark 3:28
Verily I say unto you, All sins shall be forgiven unto men's children: and blasphemy, wherewith they blaspheme:
Luke 12:10
And whosoever speaketh a word against the son of man, it shall be forgiven him. But unto him that blasphemeth the holy ghost, it shall not be forgiven.