For the source text click/tap here: Nerdarim 60
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The Mishna of our new perek 8 stated: [If his vow was for] “this year,” wine is forbidden (to him) for the rest of the year. The Gemora inquires: If one said, “Wine shall be konam upon me with regard to my tasting for a day,” what is the halachah? Is the law akin to a case where he said “today” (and the neder would lapse at nightfall), or is it like the case of “one day” (where the neder would be effective for twenty-four hours)?
The Gemora attempts to resolve this: Come and hear from our Mishna: If one said, “Wine shall be konam upon me with regard to my tasting today,” wine is forbidden (to him) only until nightfall. But (we may infer), if he said, “a day,” it is as if he said, “one day” (and the neder would be effective for twenty-four hours). The Gemora disagrees: Let us consider the latter part of the Mishna: If the terminology of his vow was “for one day,” wine is forbidden (to him) from day to day (i.e., a day of twenty-four hours). But (we may infer), if he said, “a day,” it is as if he said “today” (and the neder would lapse at nightfall).
We explore the halachic notion of time and the division of time as applied to the molad.