Reference for Bava Kamma 61:6

רב נחמן בר יצחק אמר אפילו תימא לא היה לו לעמוד היה לו להזהיר ולא הזהיר

had [meanwhile had every possibility] to rise and nevertheless did not rise. [But] R. Nahman b. Isaac said: You may even say that [the Mishnah speaks also of a case] where he<span class="x" onmousemove="('comment',' The first potter. ');">³</span>

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