Deuteronomy 13:17-18

17You are to gather all its plunder into the middle of the street, and you are to burn with fire the city and all its plunder—all of it to Adonai your God. It will be a ruin forever—it shall never be built again.

18Nothing from the ban should cling to your hand, so that Adonai may turn from the fierceness of His anger and show you mercy, and have compassion on you and multiply you, just as He swore to your fathers—