Romans 3:5

But if our unrighteousness demonstrates the righteousness of God, what shall we say? Is God unjust who inflicts wrath? (I speak as a man.)

Surrounding context

3:4 Certainly not! Indeed, let God be true but every man a liar. As it is written: "That You may be justified in Your words, And may overcome when You are judged."

3:5 But if our unrighteousness demonstrates the righteousness of God, what shall we say? Is God unjust who inflicts wrath? (I speak as a man.)

3:6 Certainly not! For then how will God judge the world?

Translation and sources