Joshua 7:12-13

That is why the Israelites are running from their enemies in defeat. For now Israel itself has been set apart for destruction. I will not remain with you any longer unless you destroy the things among you that were set apart for destruction. “Get up! Command the people to purify themselves in preparation for tomorrow. For this is what the LORD, the God of Israel, says: Hidden among you, O Israel, are things set apart for the LORD. You will never defeat your enemies until you remove these things from among you.