Commentary for Parah 5:6
בֵּיצַת הַיּוֹצְרִים, כְּשֵׁרָה. רַבִּי יוֹסֵי פוֹסֵל. בֵּיצַת הַתַּרְנְגֹלֶת, רַבִּי מֵאִיר וְרַבִּי יְהוּדָה מַכְשִׁירִין, וַחֲכָמִים פּוֹסְלִין:
The craftsman's egg [a type of plaster mold with a cavity for creating vessels] is valid [for sanctifying the <i>chatat</i> waters]. Rabbi Yosse invalidates it. A chicken's egg[shell], Rabbi Meir and Rabbi Yehuda validate it; and the Sages invalidate it.
Bartenura on Mishnah Parah
ביצת היוצרים – every vessel that the potter of earthenware begins to make, he first makes the material round like the form of an egg and makes for it a receptacle.
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English Explanation of Mishnah Parah
A potters’ egg is fit [as a vessel]. Rabbi Yose rules that it is unfit. A "potters' egg" is an egg shaped piece of plaster made by the potter and from which he will form a vessel. It has a receptacle. The first opinion holds that this egg is usable for mixing the ashes and water and to sprinkle from it for it is already considered a vessel. Rabbi Yose says that it is not yet a vessel and therefore cannot be used.
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Bartenura on Mishnah Parah
כשרה – to mix in it the waters of lustration/sin-offering.
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English Explanation of Mishnah Parah
A hen's egg: Rabbi Meir and Rabbi Judah rule it is fit [as a vessel]; But the sages rule that it is unfit. Rabbi Meir and Rabbi Judah hold that even a hen's egg is considered a vessel and therefore can be used. However, the other sages (understandably, in my opinion) disagree.
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Bartenura on Mishnah Parah
ור' יוסי פוסל – for it is not considered a vessel to him. But the Halakha is not according to Rabbi Yossi.
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Bartenura on Mishnah Parah
ביצת התרנגולת – its outer shell.
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Bartenura on Mishnah Parah
וחכמים פוסלים – for it is not considered a vessel. And the Halakha is according to the Sages.
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