Chi mangia cibi di secondo grado [impurità] non dovrebbe lavorare in un frantoio [poiché il suo corpo diventa di secondo grado, e quindi rende impuri i liquidi]. E i cibi non sacri che sono stati preparati con la severità dei cibi sacri seguono ancora le regole dei cibi non sacri [cioè a differenza dei cibi sacri, non possono essere resi di terzo grado da un'impurità di secondo grado, né sono resi di quarto grado da un terzo grado di impurità]. Rabbi Elazar bar Rabbi Tzadok dice: In realtà sono come teruma , in quanto [se toccano un'origine di impurità] due sono resi impuri [quelli resi di impurità di primo e secondo grado] e uno è invalidato [quello di terzo grado ; e non produce un quarto].
Bartenura on Mishnah Tahorot
האוכל אוכל שני לא יעשה בבית הבד – he should not engage in the making of [olive] oil in the olive press, for Rabbi Yehoshua above (in Mishnah 2 of our chapter) agrees with Rabbi Eliezer that a person who consumes food that is second degree [of ritual impurity] he himself becomes second degree [of ritual impurity and invalidates the heave offering and defiles liquids to be first degree [of ritual impurity] (that is the oil).
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English Explanation of Mishnah Tahorot
If one eats food with second [degree uncleanness he must not work in an olive-press. A person who eats food with second degree uncleanness gets second degree uncleanness, as we learned in mishnah two. Therefore, he shouldn't work in an olive press because when he touches the olive oil, he will convey to it first degree uncleanness, because it is a liquid.
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Bartenura on Mishnah Tahorot
על גב הקודש – on the purification of Holy Things.
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English Explanation of Mishnah Tahorot
Common food that was prepared under conditions proper to the cleanness of consecrated food is still regarded as common food. Rabbi Elazar bar Zadok says: it is regarded as terumah to convey uncleanness at two removes and to render terumah invalid at one additional remove. The mishnah again makes reference to common food (hullin) that was prepared under the conditions of purity that are normally used for holy food. Such food is still considered to be hullin, and therefore there is no such thing as third degree impurity. Food that had contact with such food that had second degree impurity can still be eaten. Rabbi Elazar bar Zadok says that it is like terumah. First and second degree are impure, third degree is invalid but doesn't convey impurity onward. In other words, by treating this common food as if it was holy, it does attain added holiness.
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Bartenura on Mishnah Tahorot
הרי אלו כחולין – and they don’t come into the category of third-degree [of ritual impurity].
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Bartenura on Mishnah Tahorot
הרי אלו כתרומה – and they do have a third degree [of ritual impurity]. And these Tannaim/Mishnaic teachers both of them (see the previous Mishnah) hold that unconsecrated foods that were made through the purification of Holy Things are not similar to Holy Things, for there isn’t anything that makes fourth degree [of ritual impurity] other than Holy Things from Holy Things alone. And they dispute with the Mishnah above (i.e., the previous Mishnah) that teaches that “third degree [of ritual impurity] spoils foods of Holy Things”/"השלישי שבכולן ...פוסל לאוכלי קודש".