Deuteronomy 7:1-3

1When the Lord your God brings you to the land that you are going to occupy and forces out many nations before you – Hittites, Girgashites, Amorites, Canaanites, Perizzites, Hivites, and Jebusites, seven nations more numerous and powerful than you –

2and he delivers them over to you and you attack them, you must utterly annihilate them. Make no treaty with them and show them no mercy!

3You must not intermarry with them. Do not give your daughters to their sons or take their daughters for your sons,