Reference for Bava Kamma 11:23

אלא דלא אפקרינהו לשמואל דאמר כולם מבורו למדנו היינו בור

who maintains that we deduce [the law governing] all nuisances from Pit, they are [again] equivalent to Pit? — Indeed they were abandoned, still they are not equivalent to Pit: Why [is liability attached] to Pit if not because of its being unlawful?<span class="x" onmousemove="('comment',' It being unlawful to dig a pit in public ground. ');">¹⁸</span>

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