I used to think the unforgiveable sin was Metallica’s Black Album. It’s not.
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.
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. (KJV)
It’s unforgiveable sins. Exit Sandman? Satan laughing spreads his wings.