Commentary for Eruvin 31:4

כל שהוא ג' ומג' עד ד' צריך שלא יהא בין זה לזה כמלואו כדי שלא יהא פרוץ כעומד ואם היה פרוץ מרובה על העומד אף כנגד העומד אסור

so that a kid could not leap headlong [through it].<span class="x" onmousemove="('comment',' The law of labud (v. Glos.) is applied in such a case even where the total area of the gaps exceeds that of the reeds. If a gap is wider than three handbreadths, a kid can leap headlong through it and the law of labud cannot consequently apply.');">⁶</span> Wherever [the width of each reed is] three, or from three to four<span class="x" onmousemove="('comment',' But not actually four.');">⁷</span>

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