Commentary for Avodah Zarah 72:7
זנות נמי בבית דינו של שם גזרו דכתיב (בראשית לח, כד) ויאמר יהודה הוציאוה ותשרף
But non-marital sex had already been decreed against by the Court of Shem, for it is written, And Judah said, “Bring her forth and let her be burned” (Genesis 38:24).
Daf Shevui to Avodah Zarah
In Genesis 38 Judah suspects that Tamar has had sex outside the framework of marriage. The simple reading of this chapter is that Judah is accusing her of quasi-adultery, but the rabbis read it as non-marital sex. The fact that he states that she is to be penalized for this, implies that sex with a non-Jew is prohibited (he assumes that she had sex with a non-Jew because there were not really that many Israelites around then). So how can we say that the students of Shammai and Hillel initiated this prohibition?
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