Reference for Bava Kamma 78:15

ולאביי דאמר פליגי במאי פליגי

For does not any other owner similarly pay half-damages? If [on the other] hand we are dealing with a <i>Mu'ad</i>, then where proper precautions were taken to control it, why should any payment be made at all?<span class="x" onmousemove="('comment',' Since so far as the owner was concerned the damage occurred by accident. ');">¹⁰</span>

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