To serve other Gods — That is, there is manifest danger of apostacy and idolatry from such matches. Which reason doth both limit the law to such of these as are 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.