Actually, that is not true. There are two unforgiveable sins. First….
Luke 12:10: “Anyone who speaks a word against the Son of Man, it will be forgiven him; but to him who blasphemes against the Holy Spirit, it will not be forgiven.”
And there is another unforgiveable sin: unforgiveness.
Matthew 6:15: “If you do not forgive men their trespasses, neither will your Father forgive your trespasses.”
Other than these two, our Lord Jesus has forgiven every type of gross sin imaginable to man, perhaps every imaginable sin millions of times since Adam. Serial killers have found redemption, as well as child molesters and pimps and satanists and so many etceteras.
A brother in Christ once confided he had committed every sin except murder before finding Christ. A violent and twisted New York gang leader testifies how he was suddenly saved and set free, and since has led many teens to Christ. (See note.)
Not only is Jesus willing to forgive, He wants to forgive. That’s why the Holy Spirit “convict[s] the world of sin”. Without this conviction no person could be saved.
John 3:17: “God did not send His Son into the world to condemn the world, but that the world through him might be saved.”
Note: Run Baby Run by Nicky Cruz.