Reference for Niddah 51:41

תלת מתניתא ותרתי שמעתתא שיעורא טפח

R. Simeon b. Gamaliel explained: It must be of such a size as can be held in one's hand and be seen at either end, viz.,<span class="x" onmousemove="('comment',' Cf. Tosaf. Asheri. ');">³⁸</span>

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