There are some things even Jesus won’t forgive.
Seriously. Take a moment to read Mark 3:22-30. This passage contains a concept both frequently debated and generally misunderstood: blasphemy against the Holy Spirit. My personal take on the story: the Pharisees don’t recognize good leadership (and that is why they attribute Jesus’ power to Beelzebub instead of God). Their worldview was so corrupt that they confused good with evil (see a warning about this in Isaiah 5:20). And as we know from elsewhere in the gospels, the Pharisees not only confused Jesus’ power source, they also actively resisted him.