Mt 12,29-32.

How can one enter a strong man’s house and plunder his property, without first tying up the strong man? Then indeed the house can be plundered.
Whoever is not with me is against me, and whoever does not gather with me scatters.
Therefore I tell you, people will be forgiven for every sin and blasphemy, but blasphemy against the Spirit will not be forgiven.
Whoever speaks a word against the Son of Man will be forgiven, but whoever speaks against the Holy Spirit will not be forgiven, either in this age or in the age to come.