Deuteronomy 13
15 Ref 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 Ref 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.