Deuteronomy 7:1-3

1“When the Lord your God brings you into the land which you are entering to possess, and has cleared away many nations before you, the Hittite and the Girgashite and the Amorite and the Canaanite and the Perizzite and the Hivite and the Jebusite, seven nations greater and mightier than you,

2and when the Lord your God gives them over to you and you defeat them, then you shall utterly destroy them. You shall not make a covenant (treaty) with them nor show mercy and compassion to them.

3You shall not intermarry with them; you shall not give your daughter to his son, nor shall you take his daughter for your son;