Romans 2:13-15

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

14For when the Gentiles, who have not the law, do by nature the things contained in the law, these, having not the law, are a law to themselves:

15Who show 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;)12