Titus 1:15 in the King James Version
Unto the pure all things are pure: but unto them that are defiled and unbelieving is nothing pure; but even their mind and conscience is defiled.
Context
14 not paying attention to Jewish fables and commandments of men who turn away from the truth.
15 To the pure, all things are pure, but to those who are defiled and unbelieving, nothing is pure; but both their mind and their conscience are defiled.
16 They profess that they know God, but by their deeds they deny him, being abominable, disobedient, and unfit for any good work.