Deuteronomy 13:16-18

13:16 You must gather all of its plunder into the middle of the plaza and burn the city and all its plunder as a whole burnt offering to the Lord your God. It will be an abandoned ruin forever – it must never be rebuilt again. 13:17 You must not take for yourself anything that has been placed under judgment. Then the Lord will relent from his intense anger, show you compassion, have mercy on you, and multiply you as he promised your ancestors. 13:18 Thus you must obey the Lord your God, keeping all his commandments that I am giving you today and doing what is right before him.