Deuteronomy 13:15-17 - WEB
15
you shall surely strike the inhabitants of that city with the edge of the sword, destroying it utterly, and all that is therein and the cattle of it, with the edge of the sword.
16
You shall gather all the spoil of it into the midst of the street of it, and shall burn with fire the city, and all the spoil of it every whit, to Yahweh your God: and it shall be a heap forever; it shall not be built again.
17
There shall cleave nothing of the devoted thing to your hand; that Yahweh may turn from the fierceness of his anger, and show you mercy, and have compassion on you, and multiply you, as he has sworn to your fathers;
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