Commentary for Eruvin 1:4
רְחָבָה, כְּדֵי לְקַבֵּל אָרִיחַ, וּבְרִיאָה, כְּדֵי לְקַבֵּל אָרִיחַ. רַבִּי יְהוּדָה אוֹמֵר, רְחָבָה אַף עַל פִּי שֶׁאֵין בְּרִיאָה:
(The korah must be) wide enough to receive an ariach and strong enough to receive an ariach [i.e., to support its weight without breaking. And this is the halachah.] R. Yehudah says: Wide enough, even if it is not strong enough.
Bartenura on Mishnah Eruvin
בריאה לקבל אריח – strong [enough] to endure the weight of the small bricks that it wouldn’t break. And this is the Halakha.
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English Explanation of Mishnah Eruvin
Introduction
This mishnah is a direct continuation of yesterday’s mishnah, in which we learned that the cross-beam needs to be wide enough to support a half-brick.
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English Explanation of Mishnah Eruvin
Wide enough to hold a half-brick but also strong enough to support such a half-brick. Rabbi Judah says: wide enough, even though it is not strong enough. In this mishnah there is a debate whether or not the cross-beam must actually be strong enough to support the half-brick, or whether it is sufficient for it to merely look big enough. According to the first opinion, the cross-beam must actually be strong enough, whereas Rabbi Judah holds that is must only be wide enough, but not actually strong enough.
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