Reference for Bekhorot 74:61

בעא מיניה רב הושעיא מרב הונא רבה

For we have learnt: In a light-hole which was not made by the agency of man,<span class="x" onmousemove="('comment',' A wall breaking a little of itself between two houses, thus making an opening letting in light.');">²⁶</span>

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