Titus 1:14-16

14 Giving no attention to the fictions of the Jews and the rules of men who have no true knowledge.

15 To the clean in heart all things are clean: but to those who are unclean and without faith nothing is clean; they become unclean in mind and in thought.

16 They say that they have knowledge of God, while by their acts they are turning their backs on him; they are hated by all, hard-hearted, and judged to be without value for any good work.