Deuteronomy 13:12-15

12If, regarding one of the cities the LORD your God is giving you to inhabit, you hear it said 13that wicked men have arisen from among you and have led the people of their city astray, saying, “Let us go and serve other gods” (which you have not known), 14then you must inquire, investigate, and interrogate thoroughly. And if it is established with certainty that this abomination has been committed among you, 15you must surely put the inhabitants of that city to the sword. Devote to destruction1 all its people and livestock.