For they will turn your sons away from following Me, to serve other gods; so the anger of the LORD will be aroused against you and destroy you suddenly.
Deuteronomy 7:4
Surrounding context
7:3 Nor shall you make marriages with them. You shall not give your daughter to their son, nor take their daughter for your son.
7:4 For they will turn your sons away from following Me, to serve other gods; so the anger of the LORD will be aroused against you and destroy you suddenly.
7:5 But thus you shall deal with them: you shall destroy their altars, and break down their sacred pillars, and cut down their wooden images, and burn their carved images with fire.