Deuteronomy 7:2-6

and when the LORD your God gives them over to you and you defeat them, then you shall utterly destroy them. You shall not make a covenant (treaty) with them nor show mercy and compassion to them. You shall not intermarry with them; you shall not give your daughter to his son, nor shall you take his daughter for your son; for they will turn your sons away from following Me to serve other gods; then the anger of the LORD will be kindled and burn against you and He will quickly destroy you. But this is how you shall deal with them: you shall tear down their altars and smash to pieces their sacred pillars, and cut down their Asherim (symbols of the goddess Asherah), and burn their carved or sculpted images in the fire. For you are a holy people [set apart] to the LORD your God; the LORD your God has chosen you out of all the peoples on the face of the earth to be a people for His own possession [that is, His very special treasure].