Deuteronomy 7:2-4

and when the LORD your God delivers them before you and you defeat them, then you shall utterly destroy them. You shall make no covenant with them and show no favor to them. 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.