Matthew 12:24, 30-31

But the Pharisees heard it and said, “This man casts out demons only by [the help of] Beelzebul (Satan) the prince of the demons.”

He who is not with Me [once and for all on My side] is against Me; and he who does not [unequivocally] gather with Me scatters. [Luke 9:50; 11:23] “Therefore I say to you, every sin and blasphemy [every evil, abusive, injurious speaking, or indignity against sacred things] will be forgiven people, but blasphemy against the [Holy]Spirit will not be forgiven.