Talmud for Eruvin 7:9

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

R. Yossi said: When is this so [that the above amounts are required]? At the beginning of (the making of) the eruv, but with the remnant of the eruv [i.e., with that which fell below the required amount], any amount suffices, for they ordained making an eruv in the courtyards [after they had made a partnership in the mavui] only so that it [the institution of courtyard eruvin] not be forgotten by the children, who do not know about the partnership in the mavui, for which reason we are lenient in this regard. But even though this (the above) is the reason for this ordinance, still, the halachah is not in accordance with R. Yossi in regard to the remnant of the eruv. We do not rule so leniently (as he does)].

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