Deuteronomy 7:2-3

7:2 and 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! 7:3 You must not intermarry with them. Do not give your daughters to their sons or take their daughters for your sons,

Deuteronomy 7:16

Exhortation to Destroy Canaanite Paganism

7:16 You must destroy all the people whom the Lord your God is about to deliver over to you; you must not pity them or worship their gods, for that will be a snare to you.