The Gemara brings an argument about the Torah's prohibition on intermarriage. R' Shimon holds we Darshin the reason of the Pasuk. All the Torah needs to say by the seven nations they can't marry and I would know that they are prohibited exclusively. The reason of intermarriage so that the wife will convince him to go off the Torah's path. I would assume it only applies to the seven nations who were totally against the Torah's way of life. So the Torah says"because she'll lead him off" to include all Goyim who'll remove him from the Torah's way of life at one degree or another.
The Rabanan doesn't Darshen the reason of the Pasuk. When the Pasuk says that it's forbidden to intermarry I would assume any Goy. So the Torah says "because she'll lead him off" to tell us only the seven nations are prohibited from the Torah. The other nations are prohibited from the Rabanan.
Tosfos points out, that though in Yevamos we Darshin that you cannot marry someone from the seven nations even after Geirus. (Since the simple meaning of marriage is only after she converts and can have Kiddushin.) Although after conversion we cannot say there is a reason to exclude the seven nations more than the others, because after conversion she is for the Torah's way of life and would not mislead him. However, Chazal says it only applies to the seven nations.
The reasoning for that is that we see the Torah forbade a Mitzri and Adomi and Moabi and Amoni, it implies that the other converts are permitted.
Rabbi Chaim Smulowitz
Tosfos Project
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