Commentary for Eruvin 155:9

אמר ליה רב אחא בריה דרבא לרב אשי מלאו כולו ביתדות מהו

was three handbreadths high. What is the reason? - It is possible to suspend some object from it.<span class="x" onmousemove="('comment',' And since the post can still be used as a private domain for this purpose, the peg cannot effect any valid reduction in the surface of its top which, consequently, remains a private domain.');">²²</span> R'Aha son of Raba asked R'Ashi, 'What is the ruling where it<span class="x" onmousemove="('comment',' The top of the post.');">¹⁹</span>

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