Titus 3:9-11

9But stay away from people who argue about silly things. They study long lists of their families' names from years ago. Refuse to quarrel with people like that. Refuse to argue about the rules in God's Law. All those kinds of things have no value and they do not help anyone.

10If someone teaches a false message that causes trouble, warn him. If you warn him twice and he still does not stop, stay away from him.

11You know that a person like that has chosen not to believe the true message. He knows that he is doing a bad thing, but he continues to do it.