Deuteronomy 7:2; Deuteronomy 7:5

2 and when the LORD your God gives them over to you, and you defeat them, then you must devote them to complete destruction.You shall make no covenant with them and show no mercy to them.

5 But thus shall you deal with them: you shall break down their altars and dash in pieces their pillars and chop down their Asherim and burn their carved images with fire.