Joshua 6:17-18

17Now the city and everything in it must be devoted to the LORD for destruction.1 Only Rahab the prostitute and all those with her in her house will live, because she hid the spies we sent. 18But keep away from the things devoted to destruction, lest you yourself be set apart for destruction. If you take any of these, you will set apart the camp of Israel for destruction and bring disaster upon it.