Deuteronomy 13:13-18

13that troublemakers have arisen among you and have led the people of their town astray, saying, “Let us go and worship other gods” (gods you have not known), 14then you must inquire, probe and investigate it thoroughly. And if it is true and it has been proved that this detestable thing has been done among you, 15you must certainly put to the sword all who live in that town. You must destroy it completely, both its people and its livestock. 16You 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, 17and 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— 18because you obey the Lordyour God by keeping all his commands that I am giving you today and doing what is right in his eyes.