Reference for Bava Metzia 175:4

ורבי ינאי נמי הכתיב בשעריך ההוא מיבעי ליה דמעייל ליה דרך שער לאפוקי דרך גגות וקרפיפות דלא

But according to R. Johanan, is it not written, out of mine house? — He can answer you: [It teaches that] the court yard must be similar to the house [in order to impose liability]: just as a house is guarded, so also must the courtyard be guarded.<span class="x" onmousemove="('comment',' But if free and open to all, it establishes no liability. ');">⁴</span>

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