Reference for Avodah Zarah 72:5

בנותיהן דאורייתא היא דכתיב (דברים ז, ג) לא תתחתן בם דאורייתא ז' אומות אבל שאר עובדי כוכבים לא ואתו אינהו וגזור אפילו דשאר עובדי כוכבים

But the prohibition against marrying their daughters is a Biblical law, for it is written, “Do not marry them” (Deuteronomy 7:3)! It is forbidden from the Torah to marry one from the seven nations [of Canaan] but this does not include other non-Jews; and they [the Schools of Hillel and Shammai] came and decreed against these also.

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