Deuteronomy 7:3-5

neither shall you make marriages with them. You shall not give your daughter to his son, nor shall you take his daughter for your son.

For he will turn away your son from following me, that they may serve other gods. So the LORD’s anger would be kindled against you, and he would destroy you quickly.

But you shall deal with them like this. You shall break down their altars, dash their pillars in pieces, and cut down their Asherah poles, and burn their engraved images with fire.