Joshua 7:12-13

That is why the Israelites cannot stand against their enemies; they turn their backs and run because they have been made liable to destruction. I will not be with you anymore unless you destroy whatever among you is devoted to destruction. “Go, consecrate the people. Tell them, ‘Consecrate yourselves in preparation for tomorrow; for this is what the LORD, the God of Israel, says: There are devoted things among you, Israel. You cannot stand against your enemies until you remove them.