Talmud for Tahorot 2:8
הָאוֹכֵל אֹכֶל שֵׁנִי, לֹא יַעֲשֶׂה בְּבֵית הַבָּד. וְחֻלִּין שֶׁנַּעֲשׂוּ עַל גַּב קֹדֶשׁ, הֲרֵי אֵלּוּ כְחֻלִּין. רַבִּי אֶלְעָזָר בַּר רַבִּי צָדוֹק אוֹמֵר, הֲרֵי אֵלּוּ כִתְרוּמָה, לְטַמֵּא שְׁנַיִם וְלִפְסֹל אֶחָד:
One who is eating foods of a second degree [impurity] should not work in an olive press [since his body becomes of a second degree, and he then renders liquids impure]. And non-sacred foods that were prepared with the stringency of sacred foods still follow the rules of non-sacred foods [i.e. unlike sacred foods, they cannot be rendered third degree by a second degree impurity, nor are they rendered fourth degree by a third degree impurity]. Rabbi Elazar bar Rabbi Tzadok says: In fact they are like <i>terumah</i>, in that [if they touch an origin of impurity] two are rendered impure [those rendered of a first and second degree impurity] and one is invalidated [that of a third degree; and it does not produce a fourth].
Jerusalem Talmud Niddah
In Babli and Tosephta it is stated that the impurity in effect should have been retroactive, that the ruling as given fits only extraordinary circumstances. One may assume that the Yerushalmi refers to a similar text and that Rav Ḥisda the Babylonian’s question really refers to this, that under normal circumstances the impurity of a menstruating woman without regular period should act retroactively on food prepared in purity outside of Jerusalem. that she missed for three periods and then had a period. When the case came before the Sages, they said that her timing is exact.” Are there sacrifices in Aitlo? But it must be food prepared in the purity of sacrifices36Profane food, eaten by people who insist that they adhere to strict standards of purity. While most of these, called “fellows”, observed the standards of heave (which recognizes three degrees of derivative impurity, cf. Introduction to Tractate Demay, p. 349; Demay 2:2, Note 137), some people adhered to standards of sacrifices which recognized four degrees (Mishnah Tahorot 2:5).! Is that not really profane food37Mishnah Tahorot 2:8 decrees that profane food prepared according to the standards of sacrifices is still profane, admitting only two degrees of derivative impurity. A minority opinion admits three degrees, but certainly not four. This may be a polemic against followers of sects similar to that of Qumran, whose MMT text seems to prescribe the purity of sacrifices for all members of the group of the select few.? Explain it if it was prepared in the purity of purifying water38The water to which ashes from the red cow were added and which purified from the impurity of the dead. This water had to be guarded even from touching sacrificial food, Mishnah Parah 10:6. The ashes were available in Palestine a long time after the destruction of the Temple, cf. Berakhot1:1, Note 3; it was not impossible for a priestly family to preserve the rules of this purifying process., since purifying water has more restrictive rules than sacrifices.