REVACH L'DAF
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SUMMARY
1. Water insects found in canals and ponds are forbidden, but those found in wells, cisterns, and utensils are permitted.
2. Rebbi Yishmael expounds the words "b'Mayim b'Mayim" as a "Ribuy Mi'ut v'Ribuy," because those words are juxtaposed in the Torah.
3. One may not strain beer made from dates at night, because of the concern that a worm will catch onto the strainer and subsequently fall back into the beer.
4. If a worm crawled from beer onto the inside wall of its container, it is permitted.
5. Shmuel maintains that a worm that germinated in a pumpkin that is attached to the ground is prohibited.
6. If a worm germinated in a detached fruit and died immediately upon exiting the fruit, or if it partially exited the fruit or exited into the air and did not yet reach the ground, there is a doubt about whether the worm is prohibited.
7. If a worm germinated inside a detached fruit and exited to the top of the fruit or to the top of the pit, or it exited into an adjacent fruit, there is a doubt about whether the worm is prohibited.
8. In the first version of his statement, Rav Sheshes the son of Rav Idi maintains that a worm found in the lungs or liver of an animal is prohibited, because it originated from a source outside the animal.
9. The larvae found between the skin and the flesh of an animal are forbidden. Those found in Kosher fish are permitted.
10. The Livyasan is a Kosher fish.
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A BIT MORE
1. Whether it is derived through a "Klal Prat u'Chlal" or a "Ribuy Mi'ut v'Ribuy," water insects found in canals and ponds are included in the prohibition against eating fish which lack fins and scales, but wells and cisterns are excluded from the prohibition.
2. If they would not have been juxtaposed in the Torah, he would have derived it through a "Klal Prat u'Chlal" and not through a "Ribuy Mi'ut v'Ribuy." If it would have been derived through a "Klal Prat u'Chlal," since, according to Rebbi Yishmael, the first Klal is Davka, we would have known that water insects found in wells and cisterns are permitted without the need to derive it from "Tochlu."
3. Dates are often infested. However, if a worm is found in date beer, it is permitted, since it germinated in the date and did not crawl on the ground. If it caught onto the strainer and crawled a bit before falling back into the beer, then it is prohibited.
4. The inside wall of the utensil is regarded as the natural habitat of the worm, and it is considered as though it never left the beer and it is permitted.
5. Even though the worm did not crawl on the ground, but it crawled in the pumpkin that is attached to the ground, it is considered as though it crawled on the ground.
6. In all of these cases, the worm did not completely crawl on the ground, and therefore perhaps the Torah permits it, or maybe since it exited the fruit even though it did not actually crawl on the ground, the Torah prohibits it.
7. Since the worm is still inside, or on top of, the fruit, or it crawled into an adjacent fruit without being exposed to the air, perhaps the Torah permits it, or perhaps since the worm crawled away from its original place, the Torah prohibits it.
8. However, in the second version of Rav Sheshes, he maintains that it is permitted, because it must have germinated inside the animal. Had it originated outside the animal, it would have been found in the animal's digestive tract.
9. The larvae which germinated in the flesh of the animal or a fish attain the status of the flesh of the animal or the fish. Hence, the larvae which germinate in an animal even though it never crawled on the ground is forbidden as Ever Min ha'Chai, like the flesh of the animal, and Shechitah permits only the flesh of the animal, not the larvae. However, fish do not require Shechitah and there is no prohibition of Ever Min ha'Chai. Therefore, the larvae is permitted like the fish, as long as it did not crawl on the ground.
10. A Derashah in the Torah teaches that the Livyasan has fins and scales, and thus it is a Kosher fish.
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