Pesachim 5: Delving into Midrash Halakhah - on the verses that address the prohibition of chametz being found in one's home on Pesach, together with the prohibition against eating chametz. And then the mitzvah of eating matzah. Which brings us to a discussion of the word "rishon." And the challenge of handling Midrash Halakhah, as compared to Halakhah. Similarly, there are differences of opinion with regard to what source is used, and so on. Buy none regarding the basic practice. They certainly get engaged in their different derivations, however. Plus: The non-Jew who lives in your courtyard vs. the non-Jew whom you haven't yet conquered, which is a surprising appellation, to say the least.