Reference for Bava Kamma 181:2

ואמינא להו אנא אפילו תימא רבי עקיבא הכא במאי עסקינן כגון שברח

[of the instrument] by the Court of Law is essential [before any liability can be imposed]; and in this case where the sentence has already been passed on the ox to be stoned<span class="x" onmousemove="('comment',' Lit., 'to be killed'. ');">²</span>

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