Deuteronomy 13:15-18

15you must kill the residents of that city with swords and destroy that city and everyone in it, including the animals, because they are claimed by God.

16Gather their goods into the middle of the city square. Then burn their city and all their goods as a burnt offering to the Lord your God. It must remain a mound of ruins and never be rebuilt.

17Don’t ever take any of the things claimed for destruction. Then the Lord will stop being angry and will show you mercy. In his mercy he will make your population increase, as he swore to your ancestors.

18The Lord your God will do this if you listen to him, obey all the commands that I’m giving you today, and do what he considers right.