You can believe the Bible or some who does not believe the Bible
The Jewish religious leaders of Jesus day who opposed Jesus did commit willful, and thus unforgivable, sin.
They sinned with their eyes wide open to the undeniable operation of God’s spirit. Thus, they committed unforgivable sin, for Jesus said: “Whoever speaks against the holy spirit, it will not be forgiven him, no, not in this system of things nor in that to come.”—Matthew 12:22-32.
So of Judas Iscariot is also unforgivable. His betrayal of Jesus was the willful, deliberate culmination of a course of hypocrisy and dishonesty.
The apostle John added: Judas said this, though, not because he was concerned about the poor, but because he was a thief and had the money box and used to carry off the monies put in it.” Soon thereafter, Judas betrayed Jesus for 30 pieces of silver. (John 12:1-6; )
True, Judas felt remorse and committed suicide. (Matthew 27:1-5) But he was not forgiven, since his deliberate, persistently selfish course and his treacherous act reflected his sin against the holy spirit.
That why Jesus said: 21 For the Son of man is going away, just as it is written about him, but woe to that man through whom the Son of man is betrayed! It would have been better for that man if he had not been born.-Mark 14:21.