Chullin 138 - September 15, 4 Tishrei

Reconciling Rav's two rulings on the required fleece yield, where he states "a mane and a half" (mane v'pras) in one context and "sixty" in another, the Gemara explains that Rav refers to a mane of forty sela'im, making a mane and a half equal to sixty sela'im.

Regarding the five-sela'im gift, a braita clarifies that the owner is not required to bleach the wool before giving it; rather, he must provide enough wool so that five sela'im remain after the kohen bleaches it. Deriving from "l'amod l'sharet" ("to stand and serve"), Rabbi Yehoshua ben Levi explains that the gift must yield enough processed wool to weave a small priestly garment - specifically identifying the belt (avnet) as the smallest garment used in Temple service.

If one shears each sheep and immediately sells it before shearing the next, Rav Chisda obligates the owner because shearing occurred under one's ownership, whereas Rabbi Natan bar Hoshaya exempts because complete flock ownership was lacking when the total required quantity was met (when all five sheep were sheared).

In sales where a buyer purchases shearings from a flock, if the seller keeps some of the shearings, the seller is obligated in the mitzva. The amoraim try to find a tannaitic opinion by which to explain this ruling. Rav Chisda's suggestion is rejected, and Rava connects it with a Mishna regarding the priestly gifts. A seller cannot sell the kohen's portion as it does not belong to the seller, but to the kohen. Thus, if the seller retained any shearings, the liability remains with the seller, but if no shearings were retained, liability falls upon the buyer.

Beginning Chapter 12, the Mishna defines the mandate to send away the mother bird (shiluach haken), contrasting its scope with the commandments in the previous chapters. Rabbi Avin and Rabbi Meisha compare the structure of the previous chapters and highlight which laws were necessary, and which were brought just as a foil. The Gemara explains why consecrated birds as well as a kosher bird condemned by a court are exempt from this commandment.