Reference for Bava Kamma 56:13

א"ר אלעזר לא שנו אלא שנתקל באבן ונשוף באבן אבל נתקל בקרקע ונשוף באבן פטור

<i> 'An ox'</i> excluding man; <i>'an ass'</i> excluding inanimate objects. Hence the Rabbis stated: If there fell into it an ox together with its tools and they thereby broke, [or] an ass together with its equipment which rent, there is liability for the beast but exemption as regards the inanimate objects.<span class="x" onmousemove="('comment',' V. infra 52a. ');">¹⁰</span>

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