Deuteronomy 13:13-16

13“Suppose you hear it said in one of your cities, which Adonai your God is giving you to dwell in,

14that worthless fellows have gone out from among you and enticed the inhabitants of their city, saying, ‘Let’s go and serve other gods’—that you have not known.

15Then you are to investigate, search out and inquire thoroughly. If indeed it is true and the matter certain that this abomination has been done in your midst,

16you will surely strike down the inhabitants of that city with the edge of the sword, utterly destroying it and all that is in it and its livestock with the sword.