Joshua 6:17-18

The city shall be under the ban, it and all that is in it belongs to the LORD; only Rahab the harlot and all who are with her in the house shall live, because she hid the messengers whom we sent. But as for you, only keep yourselves from the things under the ban, so that you do not covet them and take some of the things under the ban, and make the camp of Israel accursed and bring trouble on it.