Romans 2:12

2:12 For all who have sinned apart from the law will also perish apart from the law, and all who have sinned under the law will be judged by the law.

Romans 2:15-16

2:15 They show that the work of the law is written in their hearts, as their conscience bears witness and their conflicting thoughts accuse or else defend them, 2:16 on the day when God will judge the secrets of human hearts, according to my gospel through Christ Jesus.