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Mishnayos Eruvin Perek 7 Mishnah 9

עירובין פרק ז׳ משנה ט׳


Rabbi Yosei said: In what case is this statement said? It is said with regard to the beginning of an eiruv, when it is initially established. However, with regard to the remnants of an eiruv, e.g., if the eiruv decreased in size on Shabbat, it remains valid if even any amount remains. And in general they said that it is necessary to join the courtyards, even though a merging of the alleyways was already in place, only so that the halakhic category of eiruv will not be forgotten by the children, i.e., so that the next generation should be aware that an eiruv can be established for a courtyard, for otherwise they would be entirely unaware of this halakhic category.

אָמַר רַבִּי יוֹסֵי, בַּמֶּה דְבָרִים אֲמוּרִים, בִּתְחִלַּת עֵרוּב. אֲבָל בִּשְׁיָרֵי עֵרוּב, כָּל שֶׁהוּא. וְלֹא אָמְרוּ לְעָרֵב בַּחֲצֵרוֹת אֶלָּא כְדֵי שֶׁלֹּא לְשַׁכֵּחַ אֶת הַתִּינוֹקוֹת:


בשירי העירוב – when it diminished from its quantity.

ולא אמרו אלא לערב בחצרות – after they made a partnership in an alleyway, but rather, so that the law of the joining of courtyards not be forgotten by children that do not know that they made a partnership in an alleyway, therefore, we are lenient with it. But even though that the reason that they make an Eruv in the joining of courtyards after they had made a partnership in an alleyway is in order that the law of Eruv would not be forgotten from the children, nevertheless, the Halakha is not according to Rabbi Yossi, concerning what is added on [later] to the Eruv that it is not [part of the Eruv], we are lenient with it so much.

בשירי העירוב. שנתמעט משיעורו:

ולא אמרו לערב בחצרות. אחר שנשתתפו במבוי, אלא שלא תשתכח תורת עירובי חצירות מתינוקות שאינן יודעין שנשתתפו במבוי, הלכך מקילינן ביה. ואע״ג דטעמא דמערבין עירובי חצרות לאחר שנשתתפו במבוי הוי כדי שלא תשתכח תורת עירוב מן התינוקות, מ״מ אין הלכה כר״י בשירי עירוב, דלא מקילינן ביה כולי האי: