Halakhah su Neemia 10:78

A Jew who cohabits with a non-Jewish woman of any of the gentile nations in the manner of matrimony, or a Jewish woman who cohabits with a non-Jew in the manner of matrimony incurs the biblical punishment of lashing, as it is written, "Neither shalt thou enter into marriage with them; thy daughter thou shalt not give unto his son, nor his daughter shalt thou take unto thy son." Both the Seven Nations and all [other] nations are included in this prohibition. This is made explicit through Ezra, "And that we would not give our daughters unto the peoples of the land, nor take their daughters for our sons." (Nehemiah 10:31)

The quotation of Nehemiah 10:31 is obviously intended to establish that the prohibition against intermarriage applies to all gentile nations. In ruling in this manner, Rambam follows the opinion of R. Shimon ben Yoḥai who maintains that the prohibition, "Neither shalt thou enter into marriage with them," is applicable not only to the Seven Nations indigenous to the land of Canaan, but applies to all non-Jews equally.

Maharam Schick demonstrates that even those previously cited early authorities who maintain that a Jewish woman who consorts with a gentile does not incur the penalty of karet would nevertheless agree that, despite the absence of this severe punishment, the act constitutes a violation of a divine edict. The biblical prohibition against intercourse with gentiles applies equally to both sexes according to Maharam Schick, even though the punishment for a male is more severe than for a female. In demonstrating the cogency of this conclusion, Maharam Schick refers to the previously cited verse, Nehemiah 10:31. It is this verse which is adduced by Rambam in order to show that the prohibition encompasses all gentiles. Nehemiah refers explicitly to both "our daughters" and "our sons" thereby demonstrating that both Jewish males and Jewish females are forbidden to cohabit with non-Jews.