Matthew 12:31

So I say to you, Every sin and every evil word against God will have forgiveness; but for evil words against the Spirit there will be no forgiveness.

Luke 12:10

And if anyone says a word against the Son of man, he will have forgiveness: but for him who says evil words against the Holy Spirit, there will be no forgiveness.

Mark 3:28-30

Truly, I say to you, The sons of men will have forgiveness for all their sins and for all the evil words they say:

Isaiah 1:18

Come now, and let us have an argument together, says the Lord: how may your sins which are red like blood be white as snow? how may their dark purple seem like wool?

Acts 7:51

You whose hearts are hard and whose ears are shut to me; you are ever working against the Holy Spirit; as your fathers did, so do you.

Hebrews 6:4

As for those who at one time saw the light, tasting the good things from heaven, and having their part in the Holy Spirit,

Hebrews 10:26

For if we do evil on purpose after we have had the knowledge of what is true, there is no more offering for sins,

Hebrews 10:29

But will not the man by whom the Son of God has been crushed under foot, and the blood of the agreement with which he was washed clean has been taken as an unholy thing, and who has had no respect for the Spirit of grace, be judged bad enough for a very much worse punishment?

1 John 1:9

If we say openly that we have done wrong, he is upright and true to his word, giving us forgiveness of sins and making us clean from all evil.

1 John 5:16

If a man sees his brother doing a sin which is not bad enough for death, let him make a prayer to God, and God will give life to him whose sin was not bad enough for death. There is a sin whose punishment is death: I do not say that he may make such a request then.

Isaiah 55:7

Let the sinner give up his way, and the evil-doer his purpose: and let him come back to the Lord, and he will have mercy on him; and to our God, for there is full forgiveness with him.

Ezekiel 33:11

Say to them, By my life, says the Lord, I have no pleasure in the death of the evil-doer; it is more pleasing to me if he is turned from his way and has life: be turned, be turned from your evil ways; why are you looking for death, O children of Israel?

Matthew 12:31-32

So I say to you, Every sin and every evil word against God will have forgiveness; but for evil words against the Spirit there will be no forgiveness.

1 Timothy 1:13-15

Though I had said violent words against God, and done cruel acts, causing great trouble: but I was given mercy, because I did it without knowledge, not having faith;

1 John 2:1-2

My little children, I am writing these things to you so that you may be without sin. And if any man is a sinner, we have a friend and helper with the Father, Jesus Christ, the upright one:

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
Come now, and let us have an argument together, says the Lord: how may your sins which are red like blood be white as snow? how may their dark purple seem like wool?
Isaiah 55:7
Let the sinner give up his way, and the evil-doer his purpose: and let him come back to the Lord, and he will have mercy on him; and to our God, for there is full forgiveness with him.
Ezekiel 33:11
Say to them, By my life, says the Lord, I have no pleasure in the death of the evil-doer; it is more pleasing to me if he is turned from his way and has life: be turned, be turned from your evil ways; why are you looking for death, O children of Israel?
1 Timothy 1:13
Though I had said violent words against God, and done cruel acts, causing great trouble: but I was given mercy, because I did it without knowledge, not having faith;
Hebrews 6:4
As for those who at one time saw the light, tasting the good things from heaven, and having their part in the Holy Spirit,
1 John 1:9
If we say openly that we have done wrong, he is upright and true to his word, giving us forgiveness of sins and making us clean from all evil.
1 John 2:1
My little children, I am writing these things to you so that you may be without sin. And if any man is a sinner, we have a friend and helper with the Father, Jesus Christ, the upright one:

But

Mark 3:28
Truly, I say to you, The sons of men will have forgiveness for all their sins and for all the evil words they say:
Luke 12:10
And if anyone says a word against the Son of man, he will have forgiveness: but for him who says evil words against the Holy Spirit, there will be no forgiveness.
Acts 7:51
You whose hearts are hard and whose ears are shut to me; you are ever working against the Holy Spirit; as your fathers did, so do you.
1 John 5:16
If a man sees his brother doing a sin which is not bad enough for death, let him make a prayer to God, and God will give life to him whose sin was not bad enough for death. There is a sin whose punishment is death: I do not say that he may make such a request then.

General references

Mark 3:28
Truly, I say to you, The sons of men will have forgiveness for all their sins and for all the evil words they say:
Luke 12:10
And if anyone says a word against the Son of man, he will have forgiveness: but for him who says evil words against the Holy Spirit, there will be no forgiveness.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain