חֲצֵרוֹת הָיוּ בִירוּשָׁלַיִם בְּנוּיוֹת עַל גַּבֵּי סֶלַע וְתַחְתֵּיהֶם חָלוּל, מִפְּנֵי קֶבֶר הַתְּהוֹם. וּמְבִיאִים נָשִׁים עֻבָּרוֹת וְיוֹלְדוֹת שָׁם וּמְגַדְּלוֹת שָׁם אֶת בְּנֵיהֶן. וּמְבִיאִים שְׁוָרִים וְעַל גַּבֵּיהֶן דְּלָתוֹת, וְתִינוֹקוֹת יוֹשְׁבִין עַל גַּבֵּיהֶן וְכוֹסוֹת שֶׁל אֶבֶן בְּיָדָם. הִגִּיעוּ לַשִּׁלּוֹחַ, יָרְדוּ וּמִלְאוּם, וְעָלוּ וְיָשְׁבוּ עַל גַּבֵּיהֶן. רַבִּי יוֹסֵי אוֹמֵר, מִמְּקוֹמוֹ הָיָה מְשַׁלְשֵׁל וּמְמַלֵּא:
Había patios en Jerusalén construidos sobre roca y debajo de ellos había huecos a causa de tumbas de las profundidades. [Pasar sobre una tumba humana causa impureza ritual, que puede ser bloqueada por un espacio suficientemente amplio entre el cuerpo y la cubierta; al construir un patio sobre un hueco, se garantiza que las tumbas que son demasiado profundas para ser descubiertas no pueden hacer que las personas en el patio de arriba sean impuras.] Traerían mujeres embarazadas allí [estos patios], y darían a luz allí y criar a sus hijos allí [para asegurarse de que los niños nunca se vuelvan ritualmente impuros]. Traían bueyes y listones en sus espaldas [literalmente: puertas] y los niños se sentaban encima de ellos con tazas de piedra en sus manos. Cuando llegaron al Shiloach [arroyo], descenderían y llenarían [los vasos], y volverían a montar y se sentarían encima de ellos. El rabino Yose dice: Desde su lugar [encima de los bueyes] uno bajaría y llenaría [su copa].
Sefer HaChinukh
And if you ask, "How we could ever find a man who had never been rendered impure by a dead body ever" - the Sages said (Mishnah Parah 3:2) that there were courtyards in Jerusalem built on rock [and] below them was hollow because of the [concern over the] graves of the deep. And they would bring pregnant women and they would give birth there and raise their children there. And when they wanted to sprinkle on the priest that would burn [the heifer], they would bring oxen - as their bellies were inflated - and they would place slats (literally, doors) on their backs and the children would be made to sit on top of the slats, so that there would be a 'tent,' separating between them and the ground, because of the [concern over the] graves of the deep; and there would be stone cups in the hands of the children. And they would be brought to the waters of Shiloach, and they would descend there and fill [the cups], as there was no concern there over the graves of the deep, since it is not the way of people to bury in rivers. And they would return and mount atop the slats on top of the oxen and go to the Temple Mount. And they would descend there and walk upon their feet, since all of the Temple Mount and the yards' underneaths were hollow, due to the concern over the graves of deep. And they would walk to the opening of the [Temple] yard and take from the ashes and place them in cups; and they would sprinkle the priest that burns [the heifer]. And the children would immerse due to the concern that they had become impure with another impurity. And all of these things are from the extra stringencies of the heifer. And it was burnt on the Mountain of Anointing (Mishnah Parah 3:6).
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