Commentary for Eruvin 188:16

והא דאמר רב יהודה

since it was not stated that the ceiling was slanting.<span class="x" onmousemove="('comment',' And ordinary ceilings are flat. Breaches, on the other hand, may well assume any shape.');">²⁷</span> Rab, on the other hand, does not give the same explanation as Samuel,<span class="x" onmousemove="('comment',' That the breach in the walls of the house might be wider than ten cubits and that the ceiling presented a four sided breach.');">²⁸</span> for in that case<span class="x" onmousemove="('comment',' That four walls had to be supplied on the principle of the downward extension of a ceiling.');">²⁹</span> the house would in this respect have been in the same legal position as an exedra,<span class="x" onmousemove="('comment',' Where also four walls have to be supplied on the same principle.');">³⁰</span> and Rab follows his view that<span class="x" onmousemove="('comment',' Lit., 'who said'.');">³¹</span> it is permitted to move objects in all the interior of an exedra, for it was stated: If an exedra, was situated in a valley, Rab ruled, it is permitted to move objects within all its interior; but Samuel ruled: Objects may be moved within four cubits only. Rab ruled that it was permitted to move objects in all its interior because we apply the principle: The edge of the ceiling descends and closes up. But Samuel ruled that objects might be moved within four cubits only because we do not apply the principle: The edge of the ceiling descends and closes up.<span class="x" onmousemove="('comment',' Supra 25a q.v. notes.');">³²</span> [Where a breach was not wider than] ten cubits<span class="x" onmousemove="('comment',' Lit., 'within ten'.');">³³</span> there is no divergence of opinion between them.<span class="x" onmousemove="('comment',' Rab and Samuel. Both agree that no restrictions are to be imposed, since the gap may be treated as a doorway and the question of the principle of the downward extension of the edge of the ceiling does not arise (Rashi. Cf., however, Tosaf. a.l.) .');">³⁴</span> They only<span class="x" onmousemove="('comment',' Lit., 'when do they'.');">³⁵</span> differ where [the breach was] wider than ten cubits. Others read: Where it was wider than ten cubits there is no divergence of opinion between them,<span class="x" onmousemove="('comment',' Cf. supra n. 3. Both agree that restrictions are imposed.');">³⁶</span> and they only differ [where it was not wider than] ten cubits. With reference, however, to Rab Judah's ruling

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