Reference for Bava Kamma 61:12

הא קמ"ל דאע"ג דעמד לפוש כי קאמר לו לבעל חבית עמוד פטור

We have learnt: If the carrier of the beam was in front, the carrier of the barrel behind, and the barrel broke by [colliding with] the beam, he<span class="x" onmousemove="('comment',' The carrier of the beam. ');">⁵</span>

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