Avodah Zarah 36: "Bishul Akum" and Jews Separating from Non-Jews

On the oil that was decreed off-limits, until Rabbi Yehudah HaNasi said it was permitted. So the Gemara delves into the source of the degree, which becomes a far-ranging discussion on kashrut, impurity, and authority. Plus, a list of decrees - which were among 18 degrees that were established on one day - with massive implications for our own day and age.