Commentary for Eruvin 155:4

כותל עשרים צריך שני זיזים להתירו אמר רב חסדא והוא שהעמידן זה שלא כנגד זה

to enable it to be used as a means of access,<span class="x" onmousemove="('comment',' Between the courtyards. Lit., 'to make it permitted'. A projection in the middle point of a height of nineteen handbreadths leaves a distance of less than ten handbreadths both below and above it.');">¹⁰</span> but a wall<span class="x" onmousemove="('comment',' Between two courtyards.');">⁸</span> twenty handbreadths high requires for the purpose two projections.<span class="x" onmousemove="('comment',' One below the lower ten handbreadths of the height of the wall and the other within ten handbreadths from the top.');">¹¹</span>

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