Titus 1:13-16

13Such testimony is true. For this reason rebuke them sharply that they may be healthy in the faith

14and not pay attention to Jewish myths and commands of people who reject the truth.

15All is pure to those who are pure. But to those who are corrupt and unbelieving, nothing is pure, but both their minds and consciences are corrupted.

16They profess to know God but with their deeds they deny him, since they are detestable, disobedient, and unfit for any good deed.