בבא בתרא פג - מקורות נלווים

If one has bent a vine into the ground [and then brought it back up elsewhere], then if there is not soil over it to the height of three handbreadths, he may not sow seed above it, even if he bent [and conducted it underground] through a gourd or through a pipe. If he bent it [and conducted] it through rocky soil, then even if there is not soil over it to the height of three fingerbreadths, it is permitted to sow seed above it. As for a knee-like vine [formed by burying and conducting it underground], they don’t measure [for how much space to work it] except from its second root.

The following divide a field for peah: a stream, a pool, a private road, a public road, a public path, a private path in constant use in summer and the rainy season, fallow land, a plowed field and a different seed. One who harvested for animal fodder, [the plot] serves divides, the words of Rabbi Meir. But the sages say: it does not stop for peah unless it is plowed. A water channel that makes harvesting [on one side] impossible [while standing on the other side], Rabbi Judah says: it divides. But all of the hills that can be tilled with a hoe, even though cattle cannot pass over it in with their equipment, [is regarded as part of the field] he gives one peah from it all.

Ameimar says in the name of Rav Naḥman: There are three ducts adjacent to one another in an animal’s chest. One separates to the heart, and one separates to the lung, and one separates to the liver. The duct of the lung is treated like the lung, and renders the animal a tereifa if perforated in any amount. The duct of the liver is treated like the liver, and only if it is completely missing does it render the animal a tereifa, in accordance with the mishna. As for the duct of the heart, the aorta, Rav and Shmuel disagree as to the measure of its perforation, as mentioned above.