Romans 2:17 (KJV)

For as many as have sinned without law shall also perish without law: and as many as have sinned in the law shall be judged by the law;

(For not the hearers of the law are just before God, but the doers of the law shall be justified.

For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves:

Which shew the work of the law written in their hearts, their conscience also bearing witness, and their thoughts the mean while accusing or else excusing one another;)

In the day when God shall judge the secrets of men by Jesus Christ according to my gospel.

And knowest his will, and approvest the things that are more excellent, being instructed out of the law;

And art confident that thou thyself art a guide of the blind, a light of them which are in darkness,

An instructor of the foolish, a teacher of babes, which hast the form of knowledge and of the truth in the law.

Thou therefore which teachest another, teachest thou not thyself? thou that preachest a man should not steal, dost thou steal?

Thou that sayest a man should not commit adultery, dost thou commit adultery? thou that abhorrest idols, dost thou commit sacrilege?