Deuteronomy 7:2-4

New Life Version

² When the Lord your God gives them to you and you win the battles against them, you must destroy all of them. Make no agreement with them and show no favor to them. ³ Do not take any of them in marriage. Do not give your daughters to their sons. And do not take their daughters for your sons. ⁴ For they will turn your sons away from following Me to serve other gods. Then the anger of the Lord will burn against you. And He will be quick to destroy you.