Job's own preceding verse argues God punishes the wicked's children — part of the same speech questioning who repays.

God says no one can repay Him — a different direction but same 'repay' concept; Job asks about repaying the wicked.

God repays those who hate Him to their face — directly answers Job's question about who will repay the wicked.

2 Samuel 12:7-12 shows Nathan confronting David and declaring God's judgment — a direct example of what Job 21:31 questions, showing that the wicked are indeed confronted.

Elijah confronts Ahab to his face and pronounces judgment — a direct example of what Job questions: who will declare the wicked's way?

God says He will reprove the wicked and set their sins before them — answering Job's question of who will confront them.

John the Baptist confronts Herod about his unlawful marriage — a clear example of someone declaring his way to his face.

Paul reasons with Felix about judgment, causing him to tremble — a direct confrontation of a ruler's sin.

Paul withstands Peter to his face for hypocrisy — a specific instance of confronting a wrongdoer.

Romans 12:19 affirms that God will repay, addressing Job's lament that no one repays the wicked — divine retribution is certain.