The word "oto" (it) in the verse describing the sin offering of the Nasi, "and he slaughters it in the place where the burnt offering is slaughtered" (Vayikra 4:24), is seemingly redundant. The Gemara offers four possible suggestions for what this word is intended to teach.

The first suggestion is that the word excludes a different goat sin offering from the requirement of being slaughtered in the north - specifically, the goat offerings brought by the tribal leaders during the consecration of the Tabernacle. This is rejected because there is no logical reason to assume those goats would have required slaughter in the north, making an exclusionary verse unnecessary.
The second suggestion is that the word teaches that while the animal must be in the north during slaughter, the slaughterer does not. However, this is initially rejected because Rabbi Achiya derives this law from a different source.
The third suggestion is that only animals require slaughter in the north, excluding bird offerings. This is also rejected because birds do not require a knife for their preparation; since their procedure is entirely different, there is no reason to think they would have been subject to the northern requirement.
The final suggestion is that the Pesach offering does not need to be performed in the north. This is rejected because one would not logically derive rules for lower-level sanctity offerings, such as the Pesach, from higher-level sanctity offerings that require the north.

In conclusion, the Gemara returns to the second answer and explains Rabbi Achiya's source differently.

Regarding leavening, one is obligated if one continues any part of the leavening process of a meal offering, even if the dough had already leavened. An example of this is baking a dough that was already leavened during the kneading stage. Rav Papa adds that a person who bakes such dough is liable for two sets of lashes because the act of baking also serves as the final stage of shaping the dough. Although a difficulty is raised from a braita, the Gemara provides a resolution.

For the sake of comparison, a braita is brought regarding a firstborn animal that has a blood-related ailment requiring bloodletting. Since this animal is already considered blemished, the question arises whether it is permitted to inflict a further blemish during the procedure. Rabbi Meir, the rabbis, Rabbi Shimon, and Rabbi Yehuda each hold different positions on this issue.

The Gemara focuses specifically on the first two opinions regarding whether this is legally defined as inflicting a blemish on an already blemished animal. This topic is compared to the obligation for continuing the leavening process through a new action or to the prohibition of castrating an animal that is already castrated. In those instances, there is no debate because the biblical verses indicate liability for each individual action. However, regarding a blemished animal, Rabbi Meir and the rabbis each derive their opinions from different words in the verse, leading them to their respective conclusions.

Menachot 56 - March 8, 19 Adar