Reference for Bava Kamma 48:4

רבינא אמר במכירין בעל השור ואין מכירין את השור

is the explanation satisfactory? Why should not the last set say: "How could we have known that all those present at the Court<span class="x" onmousemove="('comment',' I.e., the witnesses that constituted the former sets. ');">⁴</span>

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