Commentary for Eruvin 189:1

קורה ד' מתיר בחורבה ורב נחמן אמר רבה בר אבוה קורה ד' מתיר במים מני

that a cross-beam<span class="x" onmousemove="('comment',' That was supported on two stakes, one at either end.');">¹</span> of the width of four handbreadths<span class="x" onmousemove="('comment',' That lay on its wide side. If the width was less, the partitions enclosing it, since the space enclosed is less than four handbreadths, would have had no validity.');">²</span> effects permissibility<span class="x" onmousemove="('comment',' Of the movement of objects under it; because its four edges are deemed to descend and to form four walls.');">³</span>

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