Daf Yomi - Beitza 5 - Decrees where the reason does not apply any longer

Rabbah maintained that Rabban Yochanan Ben Zakkai rescinded the prohibition against accepting witnesses after the offering of the afternoon tamid sacrifice, and subsequently an egg that was laid on the first day of Rosh HaShanah was permitted to be eaten on the second day. Rav Yosef challenged Rabbah’s ruling because if the Chachamim assembled to render a ruling, they would need to reassemble to revoke their ruling. Rav Yosef added that one could not say that Rabban Yochanan Ben Zakkai convened with his colleagues to permit one to eat the egg, because their decision was only to accept the testimony after the offering of the afternoon tamid sacrifice, but they never took a vote on permitting the egg to be eaten.

Tosfos rules that a matter that was only prohibited for a specific amount of time will be permitted once that time period elapses. Tosfos on Daf 6 writes that a matter that was only prohibited because of a specific concern will be permitted when the concern no longer exists. This principle justifies why we do not have to be concerned for water that was exposed at night and one is allowed to drink from it because in modern times snakes are not frequent in our homes.

Tosfos HaRosh in Avodah Zara (2a) rules that one is permitted to conduct business with gentiles during their holiday season as initially this was prohibited because gentiles in the past worshipped idols and now that gentiles do not worship idols, the decree is irrelevant.

Tosfos in Brachos (53b) writes that people are not scrupulous regarding mayim acharonim , washing the hands at the end of a meal, because we no longer have melach sedomis, salt from Sodom. Tosfos notes that although the practice of washing mayim achronmim was instituted by an assembly of a Bais Din, this institution was not unanimously accepted and thus this institution is not categorized as a ruling that is irrevocable unless a Bais Din reassembles and rescinds the ruling.

Reb Shlomo Kluger in Elef Lecho Shlomo (116) rules that one is permitted to learn by candlelight on Shabbos and we are not concerned that he may come to move the wick which will cause the fire to burn brighter, thus violating a biblical prohibition, because one does not need to move the wick of our present-day candles.

Teshuvos HaRosh (klal 2:8) rules that one is permitted to tie strings of linen on a four-cornered garment that is made from linen to fulfill the mitzvah of tzitzis and we are not concerned that one might tie strings of wool to the garment. The reason for this ruling is because all know that techeiles, a blue-dyed wool used for tzitzis, is not prevalent, thus there is no permit to tie strings of wool to a linen garment.

Teshuvos HaRosh writes that if is common knowledge why a decree was instituted and the rationale no longer applies, then the decree is considered irrelevant. Teshuvos HaRosh draws a contrast of this supposition to the case in our Gemara regarding the egg that was laid on the first day of Rosh HaShanah, because some people are not aware whey the egg was initially prohibited, nor do they understand why the reason to prohibit no longer applies.

Shearim Mitzuyanim B’Halacha rules that if necessary, one is permitted to take medicine on Shabbos. Taking medicine on Shabbos was initially forbidden as there was a concern that one would violate the prohibition of grinding. Now that medicine is prepared by the manufacturer and most people are not even aware of the process involved in manufacturing the medicine, there is no longer a concern that one who wishes to take medicine will violate the Shabbos prohibition of grinding herbs or spices.

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