Deuteronomy 13:12-15

12If thou shalt hear tell concerning one of thy cities, which Jehovah thy God giveth thee to dwell there, saying, 13Certain base fellows are gone out from the midst of thee, and have drawn away the inhabitants of their city, saying, Let us go and serve other gods, which ye have not known; 14then shalt thou inquire, and make search, and ask diligently; and, behold, if it be truth, and the thing certain, that such abomination is wrought in the midst of thee, 15thou shalt surely smite the inhabitants of that city with the edge of the sword, destroying it utterly, and all that is therein and the cattle thereof, with the edge of the sword.