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Text Excerpt
גמ׳ ורמינהו: ״מן״ העדשים״ — אסור באשישים, ורבי יוסי מתיר.
Talmud: The Mishnah cited a dispute between R' Yosei and the Rabbis, in which R' Yosei ruled that one who vows that milk is forbidden to him is prohibited from eating whey as well. And the Talmud raises a contradiction between this ruling and R' Yosei’s opinion in a later Mishnah (53b): One who vows that lentils are forbidden to him is prohibited from eating ashishim, a dish made from lentils. But R' Yosei permits it. Apparently, R' Yosei holds that if the forbidden food changes in form, it is permitted, contrary to his opinion with regard to whey.
לא קשיא: מר כי אתריה ומר כי אתריה. באתרא דרבנן קרו לחלבא חלבא ולקומא קומא, באתריה דרבי יוסי לקומא נמי קרו ליה ״קומא דחלבא״.
The Talmud answers: This is not difficult. The opinion of this Sage is in accordance with the custom of his locale, and the opinion of that Sage in accordance with the custom of his locale. In the Rabbis’ locale they call milk, milk and whey, whey, whereas in R' Yosei’s locale they also call whey, milk whey. In the latter location, the word milk is used in reference to whey, and therefore one who vows there that milk is forbidden to him is prohibited from eating whey as well.
תניא: הנודר מן החלב — מותר בקום, מן הקום — מותר בחלב. מן החלב — מותר בגבינה, מן הגבינה — מותר בחלב. מן הרוטב — מותר בקיפה, מן הקיפה — מותר ברוטב. אם אמר ״בשר זה עלי״ — אסור בו וברוטבו ובקיפו.
It is taught in a baraita: One who vows that milk is forbidden to him is permitted to partake of whey. One who vows that whey is forbidden to him is permitted to partake of milk. One who vows that milk is forbidden to him is permitted to eat cheese. One who vows that cheese is forbidden to him is permitted to partake of milk. One who vows that gravy is forbidden to him is permitted to eat sediments of boiled meat. One who vows that sediments of boiled meat are forbidden to him is permitted to eat gravy. If one said: This piece of meat is hereby forbidden to me, he is prohibited from eating it, and from its gravy, and from its sediments.