Titus 1:13-16

13This description is true. So rebuke them sharply so that they will be sound in the faith and free from doctrinal error,

14not paying attention to Jewish myths and the commandments and rules of men who turn their backs on the truth.

15To the pure, all things are pure; but to the corrupt and unbelieving, nothing is pure; both their mind and their conscience are corrupted.

16They profess to know God [to recognize and be acquainted with Him], but by their actions they deny and disown Him. They are detestable and disobedient and worthless for good work of any kind.