Deuteronomy 7:3-5

New Revised Standard Version, Anglicised Catholic Edition

³ Do not intermarry with them, giving your daughters to their sons or taking their daughters for your sons, ⁴ for that would turn away your children 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 this is how you must deal with them: break down their altars, smash their pillars, hew down their sacred poles,^[a] and burn their idols with fire.