George Haydock's Catholic Bible Commentary - Deuteronomy 23:8
Lord. The Rabbins explain this of the permission to marry the grand-children of such as had embraced the Jewish religion, though some of them suppose that an Idumean or an Egyptian woman might be taken to wife, as Solomon took the daughter of Pharao; but the Israelites could not give their children in marriage to the men of those nations. The grand-children of converts are rather hereby entitled to the privileges of other Jewish citizens. (Calmet) read more
Hawker's Poor Man's Commentary - Deuteronomy 23:7-8
It is remarkable from the first, in the instances of the fathers of both houses, Jacob as the head of Israel, and his brother Esau as the head of Edom, how the LORD drew the line of separation: see Malachi 1:2-4 . read more