Deuteronomy 7:3-5

Furthermore, you shall not intermarry with them; you shall not give your daughters to their sons, nor shall you take their daughters for your sons. For they will turn your sons away from following Me to serve other gods; then the anger of the LORD will be kindled against you and He will quickly destroy you. But thus you shall do to them: you shall tear down their altars, and smash their sacred pillars, and hew down their Asherim, and burn their graven images with fire.