Isaiah 1:18
“Come now, let us reason together, says the Lord: though your sins are like scarlet, they shall be as white as snow; though they are red like crimson, they shall (all) become like wool.
Does not apply to the Holy Spirit.
Matthew 12
31 Therefore I tell you, every sin and blasphemy will be forgiven people, but the blasphemy against the Spirit will not be forgiven. And whoever speaks a word against the Son of Man will be forgiven, but whoever speaks against the Holy Spirit will not be forgiven, either in this age or in the age to come.
Once again This verse does not apply, it only says Blasphemy against the Holy Spirit is unforgivable.
This is something which we all agree.
You have posted a verse which does not say what you said when you misrepresented Scripture. ...Below.
The only unforgivable sin is rejecting the Holy Spirit.
Mark 3
29 But whoever blasphemes against the Holy Spirit never has forgiveness, but is guilty of an eternal sin”—
Luke 12
10 And everyone who speaks a word against the Son of Man will be forgiven, but the one who blasphemes against the Holy Spirit will not be forgiven.
1 Timothy 1
13 though formerly I was
a blasphemer, persecutor, and insolent opponent. But I received mercy because I had acted ignorantly in unbelief, and the grace of our Lord overflowed for me with the faith and love that are in Christ Jesus. The saying is trustworthy and deserving of full acceptance, that Christ Jesus came into the world to save sinners, of whom I am the foremost.
Hebrews 10
29 How much worse punishment, do you think, will be deserved by the one who has spurned the Son of God, and has profaned the blood of the covenant by which he was sanctified, and has outraged the Spirit of grace?
I have clumped all of these verses which do not apply because they do not say what you said Blasphemy was.
That is why I asked for Scripture from you, the Scripture below is the only Scripture which in fact does apply. ...Nothing else.
Mat 12:24-32
24) But when the Pharisees heard it, they said, This fellow doth not cast out devils, but by Beelzebub the prince of the devils.
25) And Jesus knew their thoughts, and said unto them, Every kingdom divided against itself is brought to desolation; and every city or house divided against itself shall not stand:
26) And if Satan cast out Satan, he is divided against himself; how shall then his kingdom stand?
27) And if I by Beelzebub cast out devils, by whom do your children cast them out? therefore they shall be your judges.
28) But if I cast out devils by the Spirit of God, then the kingdom of God is come unto you.
29) Or else how can one enter into a strong man's house, and spoil his goods, except he first bind the strong man? and then he will spoil his house.
30) He that is not with me is against me; and he that gathereth not with me scattereth abroad.
31) 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.
32) And whosoever speaketh a word against the Son of man, it shall be forgiven him: but whosoever speaketh against the Holy Ghost, it shall not be forgiven him, neither in this world, neither in the world to come.
What you said is not what Jesus said, The Pharisees were attributing the work of the Holy Spirit to Satan (Beelzebub) that is Blasphemy against the Holy Spirit, which will not be forgiven.
It isn't rejection of, it's Slander of.