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A Sage View
‘It Needs A Partition To Divide It’
(Eruvin 47b-48a)

Our Gemara discusses two neighboring cities whose respective techumim meet in the middle of a pond. R. Chiya rules that an iron partition must be constructed to prevent the water of one city from intermingling with the water of the second city. If they do intermingle, it would be prohibited for the inhabitants of either city to draw water from the pond.

Why not? Because we are concerned that some water from side A of the pond might move (on Shabbos) to side B, and the people from city B will then draw that water on Shabbos. Now, since that water was originally within the techum of city A (at the onset of Shabbos), the water acquires shevisa (Sabbath residence) with the people of city A. If the water moves out of the boundary of city A (to side B in the pond) it may not be removed on Shabbos because objects (including water) that move beyond their techum may not be subsequently removed more than four amos for the duration of Shabbos.

Ownerless Objects

Tosafos (47b, s.v. “cherem,” following the textual reading found in our Vilna Shas at the beginning of 48a, “e’leima mishum d’tani lah k’R. Yochanan b. Nuri”) explains that a partition in the pond is required only according to R. Yochanan b. Nuri who maintains that ownerless objects acquire shevisa at the onset of Shabbos. However, according to the Sages (whom the halacha follows), no partition is necessary because the water in the pond is hefker and does not acquire shevisa until someone takes possession of it.

A Different View

The Mechaber (Orach Chayim 402) maintains that even according to the Sages a partition in the pond is necessary. The Gemara (supra 45b) had previously stated that rainwater that gathers in a pool near a city is subject to the techum of that city even according to the Sages. Such water is not considered hefker because the townspeople have already had in mind to use it. Therefore the rainwater acquires the techum of the city and may not be removed beyond the city’s boundary. Hence even according to the Sages a partition is required to ensure that the waters on opposite sides of the pond do not mingle.

About the Author: RABBI YAAKOV KLASS, rav of Congregation K’hal Bnei Matisyahu in Flatbush, Brooklyn, is Torah Editor of The Jewish Press. He can be contacted at yklass@jewishpress.com. RABBI GERSHON TANNENBAUM, rav of Congregation Bnai Israel of Linden Heights, Boro Park, Brooklyn, is the Director of Igud HaRabbanim – The Rabbinical Alliance of America.


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