Romans 3:3-5

3For what if some did not believe? shall their unbelief make the faithfulness of God without effect?

4By no means: verily, let God be true, but every man a liar; as it is written, That thou mayest be justified in thy sayings, and mayest overcome when thou art judged.

5But if our unrighteousness commendeth the righteousness of God, what shall we say? Is God unrighteous who taketh vengeance? (I speak as a man)