Deuteronomy 13:12-15

12If you hear it said about one of the towns the Lord your God is giving you to live in

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.