Deuteronomy 13:12-15

12If thou shalt hear in one of thy cities, which the LORD thy God hath given thee to dwell there, saying, 13Certain men, corrupt men, have gone out from among you, and have seduced the inhabitants of their city, saying, Let us go and serve other gods, which ye have not known;1 14Then shalt thou enquire, and make search, and ask diligently; and, behold, if it is truth, and the thing certain, that such abomination is wrought among you; 15Thou shalt surely smite the inhabitants of that city with the edge of the sword, destroying it utterly, and all that is in it, and its cattle, with the edge of the sword.