יט אלא אמר רב נחמן בר יצחק באפשר לפתיחת הקבר בלא דם קמיפלגי ובפלוגתא דהני תנאי דתניא קשתה שנים ולשלישי הפילה ואינה יודעת מה הפילה
19 who also stated, '[If it had the colour] of one of the four kinds of blood all agree that she is unclean', [the additional difficulty arises:] Were not red and black also mentioned and the Rabbis nevertheless differ.<span class="x" onmousemove="('comment',' From R. Judah and declare it clean. ');"><sup>37</sup></span> And should you reply that the Rabbis differ only in regard to green and white but not in that of red and black [the difficulty would arise:] For whose benefit, then, were red and black mentioned? If it be suggested: For that of R. Judah [it could be retorted:] Since green and white are regarded as unclean, was it at all necessary to mention red and black? Must it not then be conceded that these were mentioned for the benefit of the Rabbis who, it follows, do differ?<span class="x" onmousemove="('comment',' From R. Judah and declare it clean. ');"><sup>37</sup></span> — Rather, explained R. Nahman b. Isaac: The point at issue between them<span class="x" onmousemove="('comment',' R. Judah and the Rabbis. ');"><sup>38</sup></span> is the question whether it is possible for the uterus<span class="x" onmousemove="('comment',' Lit., 'grave'. ');"><sup>39</sup></span> to open<span class="x" onmousemove="('comment',' When an embryo or any other object passes out. ');"><sup>40</sup></span> without bleeding.<span class="x" onmousemove="('comment',' Blood of labour. Both R. Judah and the Rabbis regard the shapeless object as a piece of flesh, and not as a mass of congealed blood. Hence whatever its colour the woman cannot be regarded as a menstruant. R. Judah, however, maintains that the uterus never opens without some bleeding though this may sometimes escape observation. The woman is, therefore, unclean on account of the inevitable discharge of the blood of labour even though the object was green or white and no blood whatsoever had been observed. The Rabbis, on the other hand, maintain that the uterus sometimes opens without any accompanying bleeding and the woman is, therefore, clean whenever no discharge is observed. ');"><sup>41</sup></span> They<span class="x" onmousemove="('comment',' R. Judah and the Rabbis. ');"><sup>38</sup></span> thus differ on the same principle as that on which the following Tannas differ. For it was taught: If a woman was in hard labour for two days<span class="x" onmousemove="('comment',' Within the eleven days' period intervening between the menstrual periods. ');"><sup>42</sup></span> and on the third she aborted and<span class="x" onmousemove="('comment',' Besides being uncertain whether the abortion was accompanied by bleeding. ');"><sup>43</sup></span> does not know what she had aborted<span class="x" onmousemove="('comment',' Sc. whether it was an embryo or a mere lump of flesh. ');"><sup>44</sup></span>