Reference for Bava Kamma 101:13

<big><strong>מתני׳</strong></big> בור של שני שותפין עבר עליו הראשון ולא כסהו והשני ולא כסהו השני חייב:

this makes ten handbreadths, with the result that when the ox received the blow it was from the height of ten handbreadths that the blow was given.<span class="x" onmousemove="('comment',' And as a fall from the height of ten handbreadths can be fatal R. Nahman had to declare the ox trefa. ');">¹¹</span>

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