Halakhah for Eruvin 39:17
אי מהתם הוה אמינא כאן ולא סבירא ליה קא משמע לן כאן וסבירא ליה
similar to that of strips of wood around wells, and threw an object into it, is liable.<span class="x" onmousemove="('comment',' To bring a sin-offering; because the area is regarded as a properly constituted private domain.');"><sup>32</sup></span> But is not this also obvious, [for if such an imperfect enclosure] would not [have been regarded as a valid] partition elsewhere,<span class="x" onmousemove="('comment',' Cf. previous note.');"><sup>37</sup></span> how could one be permitted to move any objects [within such an imperfect enclosure] in the case of a cistern? - [The ruling]<span class="x" onmousemove="('comment',' Of R. Eleazar.');"><sup>38</sup></span>
Kitzur Shulchan Arukh
On Shabbos and Yom Tov1For it is written, “A man shall not go out from his place on the seventh day.” (Exodus 16: 29) See Maseches Eiruvin 17b. There is a question if this law is Biblical or a Rabbinic enactment. it is forbidden2Some poskim rule that Yom Tov and Shabbos are equal regarding boundaries, and others say that the laws of boundaries on Yom Tov are only derabanan, (Rabbinically ordained). to walk more than 2, 000 amos from the place you were3This refers to your place of dwelling which is determined by where you are when Shabbos begins; you then acquire shevisah. at the onset of Shabbos. This is [in addition] to the space a person occupies which is four4The space the person occupies is not included in the 2, 000 amos. Mishnah Berurah 396: 8 rules that with regard to techumin a person’s place is not four by four amos, but rather, eight by eight amos. amos. This is true only if you happen to be in the field at twilight,5Or, if you left the techum on Shabbos, in which case you must stop and remain in your place until the end of Shabbos. but if you stayed in a city6Even if the city has no surrounding wall. [Shulchan Aruch Harav 396] [at the onset of Shabbos,] then the entire city is considered your place of residence. The outskirts of the city are also considered part of the city. What are the outskirts [of the city]? An area of seventy and two third amos.7See Maseches Eiruvin 57a. [This area] is considered part of the city, even though there are no buildings there. This is called the karpeif8Means park or yard, or enclosure. [enclosure] of the city. It is from the edge of this area that we begin to measure the techum Shabbos.
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