In the last Perek (chapter), we spoke about the Matanot, the portions of the body that are given over from chullin (unconsecrated, regular) to the Kohen (priest) after they're slaughtered. Here we'll talk about Reishit HaGez, which is the first of the wool, the fleece of the animal that's given over to the Kohanim. The first of the fleece of your flock you should give to him. The owner of the sheep shears the wool, and he gives a portion to the Kohen. On a de'oraita (biblical) level, the owner only has to give Kol Shehu, whatever he wants to give to the Kohen, and he fulfills the obligation. But the rabbi said the minimum is 160th. We call it Reishit HaGez, the first of the wool, because he should really give the first of the wool that he shears, but if he didn't do so, he could fulfill the mitzvah (commandment) by giving even wool that was cut off afterwards.
Mishnah says: The mitzvah of Reishit HaGez applies both in Eretz Yisrael and outside of Eretz Yisrael, whether the Beit HaMikdash exists or it doesn't exist. It applies to unconsecrated, regular, chullin animals, but not to ones that were dedicated to the Beit HaMikdash or those that were already consecrated.
Comparing the gifts we spoke about in the last Perek—the leg, the jaws, and the stomach—with Reishit HaGez in this Perek, we're saying that the mitzvah of the Matanot—the leg, the jaws, and the stomach—is stricter than the mitzvah of Reishit HaGez in the following way: The mitzvah of the Matanot applies to both cattle and flock, sheep and goat, and it applies whether a lot of animals are being slaughtered at once or even one animal is being slaughtered individually. Automatically, this mitzvah of the Matanot applies. And with Reishit HaGez, we don't do that: the mitzvah of Reishit HaGez only applies to sheep, not to goat or cattle, and it applies only when many sheep are being sheared at the same time.