Deuteronomy 13:15-17

you must certainly put to the sword all who live in that town. You must destroy it completely, both its people and its livestock. You are to gather all the plunder of the town into the middle of the public square and completely burn the town and all its plunder as a whole burnt offering to the LORD your God. That town is to remain a ruin forever, never to be rebuilt, and none of the condemned things are to be found in your hands. Then the LORD will turn from his fierce anger, will show you mercy, and will have compassion on you. He will increase your numbers, as he promised on oath to your ancestors