Joshua 6:17-18
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17The city shall be devoted, even it and all that is therein, to Yahweh: only Rahab the prostitute shall live, she and all who are with her in the house, because she hid the messengers that we sent. 18But as for you, only keep yourselves from the devoted thing, lest when you have devoted it, you take of the devoted thing; so would you make the camp of Israel accursed, and trouble it.
Joshua 6:17-18 (WEB)