Deuteronomy 7:3-5

Revised Standard Version

³ You shall not make marriages with them, giving your daughters to their sons or taking their daughters for your sons. ⁴ For they would turn away your sons from following me, to serve other gods; then the anger of the Lord would be kindled against you, and he would destroy you quickly. ⁵ But thus shall you deal with them: you shall break down their altars, and dash in pieces their pillars, and hew down their Ashe′rim, and burn their graven images with fire.