Beginning with a new mishnah that opens on the bottom of daf 19: One may not make jewelry for an object of idolatry -- but you can be hired to do such things, as an artist. Also, note that Jews may not sell that which is attached to the ground to non-Jews. The Gemara will investigate the source of this prohibition - lo techanem - don't do them any mercy - which demands a great deal of investigation, and several possible meanings. But the meaning of the text and the term itself don't quite line up nicely enough - which gives the Gemara more fodder to interpret. Also, a story in the context of this injunction: about Turnus Rufus and Rabbi Akiva, during the Hadrianic Persecutions. The story includes praising the beauty of a woman who worshipped idols, so isn't that an example of a violation of the prohibition - except that we also appreciate the beauty God brings into the world. But men aren't supposed to be gazing on women and contacting on them, regardless of whether they are beautiful.

Avoiding wickedness and wrong-doing: Interpreting the first psalm in the Book of Psalms (Tehilim) - happy is one who does not walk in the counsel of the wicked - as in the generation of the Tower of Babel, or the people of Sodom. Plus, one should learn Torah according to what is a delight -- only that which one's heart desires. Also, if one builds beyond the part that a Jew should build (unto a host section for idolatry), the Jew should still receive his wages -- it's only an accessory to idolatry, not straight up benefit from idol worship. Indeed, under the right terms, the Jew could make the idol itself!

More on Rabbi Hanina ben Teradyon - his trial and interrogation about why he engaged in Torah study. Plus, his daughter who ended up sentenced to a brothel, and why his wife and daughter were punished on account of him. Yet, they all accepted the judgements as deserved, which raises theological questions about reward and punishment. Plus, those who worked alongside Rome and those who defied them, and the difference in their deaths (Rabbi Yossi ben Kismah and Rabbi Haninah ben Teradyon) - including the piety of Rabbi Haninah ben Teradyon, burned with the Torah scroll. With inquiries to him from his daughter, his students, and the Roman executioner. Also, recognition of Beruriah, and her mission for Rabbi Meir to go get her sister out of the brothel. Plus, the question of the "incident with Beruriah."

Jesus! Literally. An appearance in some versions of the Talmud, but not all, as these passages were excised by the Jews -- in this case, as the known teacher of a student who has an encounter with Rabbi Eliezer -- which becomes relevant as he tries to figure out why he suffered arrest for heresy by the Romans. Also, the story of Hanina ben Teradyon (more than a Who's Who) - the passage that recounts what happened to him when he was arrested by the Romans and then killed by them.

Selling horses to idolaters: Because the horse can be used for labor that isn't subject to violation of Jewish law. Also, a new mishnah prohibiting the sale of wild animals that might cause public injury -- with exceptions when the animal wasn't a risk, for whatever reason. Plus, a prohibition against building structures that would house idolatry, though other building may be acceptable.

Another "previous page" mishnah! In a place where they had the practice to sell "small" domesticated animals - sheep and goats - to non-Jews, they were permitted to do so. And in places where they didn't have the practice - they were not allowed to. But large livestock was not permitted in either place. Though some allowed the sale in the event of some damage to the large animals. Plus, the concern of these work-animals working on Shabbat. Also, a Jew cannot keep their own large animals in the stable of a non-Jew's inn, because of concerns of bestiality - an uncomfortable concern to be sure. Also, the question of selling a cow via a broker vs. selling directly (which seems like it should be prohibited). To what extent must the Jew be conscientious about selling things to non-Jews who might use those same things in ways that are objectionable in Judaism (eg - animals that would work the land during a sabbatical year). With many permutations that seem to depend on the seller's clear assumptions about the buyer.

Another mishnah placed on the previous daf: Commercial prohibitions when attempting business with idolaters - but specifically all year long, and not just at the time of their festivals. Among the prohibited items to sell to these non-Jews is a white rooster - though if sold among other roosters, and with a clipped toe (so not perfect for sacrifice), then they may be sold. Plus, the question of selling a damaged white rooster to one who asks for it. Does that mean the non-Jews don't want to make this offering, or are they putting one over on the seller? Also, a much longer, more detailed tractate of Avodah Zarah in Abraham's time (Note: of the 400 chapters mentioned - "400" is generally understood in the Gemara as being the language of exaggeration).

Again, with the relevant mishnah on the previous daf: Buying from shops that are adorned for the non-Jewish pagan holiday was prohibited. Especially when the decorations were scented (eg - roses). Which leads to defining "benefit" - as deriving benefit is what is prohibited, while causing benefit is acceptable, or at least it can be. The concern isn't that of funding idolatry, but the Jew's benefit from idolatry. Plus, those who wore a wreath of roses - an idolatrous practice - received a reduced tax rate, but if you declined, then the extra tax would cover more idolatrous practice. Also, a discussion about not cutting the tendons of a sacred animal because it looks like you're inflicting a blemish on the animal -- but it doesn't just appear like you are; you really are! That prohibition against harming the animal is even - and specifically - in the case of an animal that can't be offered to begin with.

Starting with a new mishnah from the previous daf.... A festival for the non-Jews in the next town can allow for business if the celebration is not right there. Unless heading for the city is the only possible path, in which case, observing the festival seems to be the destination. Plus, there's a lack of concern that the Jews and non-Jews might intermingle their cooking utensils - a rabbinic prohibition, in an case -- for kashrut as a parallel case to the idolatry. Also, a traveler to a place where the festival is taking place - with various concerns about appearing to bow before an idol. Plus, a concern of "danger" - so drinking, for example, directly from the water source is not recommened.

On Onkelos the convert, who is known for translating the Torah, and also for his ability to convert Romans to Judaism, as his "gift of gab" shows on this daf. Also, the particulars of another pagan festival - with several component parts - as an example of the tension between the Jews and non-Jews over their holidays.