Titus 1:10-15 GNT

10 For there are many, especially the converts from Judaism, who rebel and deceive others with their nonsense.
11 It is necessary to stop their talk, because they are upsetting whole families by teaching what they should not, and all for the shameful purpose of making money.
12 It was a Cretan himself, one of their own prophets, who spoke the truth when he said, "Cretans are always liars, wicked beasts, and lazy gluttons." For this reason you must rebuke them sharply, so that they may have a healthy faith
14 and no longer hold on to Jewish legends and to human commandments which come from people who have rejected the truth.
15 Everything is pure to those who are themselves pure; but nothing is pure to those who are defiled and unbelieving, for their minds and consciences have been defiled.
16 They claim that they know God, but their actions deny it. They are hateful and disobedient, not fit to do anything good.