i.e. There is manifest danger of apostacy and idolatry from such matches; which reason doth both limit the law to such of these as were unconverted, otherwise Salmon married Rahab, Matthew 1:5, and enlarge it to other idolatrous nations, as appears from 1 Kings 11:2 Ezra 9:2 Nehemiah 13:23.
Related Commentaries of Deuteronomy 7:4
Deuteronomy 7:4
4 For they will turn away thy son from following me, that they may serve other gods: so will the anger of the LORD be kindled against you, and destroy thee suddenly.