Talmud for Shevuot 1:2
כֹּל שֶׁיֵּשׁ בָּהּ יְדִיעָה בַתְּחִלָּה וִידִיעָה בַסּוֹף וְהֶעְלֵם בֵּינְתַּיִם, הֲרֵי זֶה בְּעוֹלֶה וְיוֹרֵד. יֶשׁ בָּהּ יְדִיעָה בַתְּחִלָּה וְאֵין בָּהּ יְדִיעָה בַסּוֹף, שָׂעִיר שֶׁנַּעֲשֶׂה בִפְנִים וְיוֹם הַכִּפּוּרִים תּוֹלֶה, עַד שֶׁיִּוָּדַע לוֹ וְיָבִיא בְעוֹלֶה וְיוֹרֵד:
Wherever there is awareness in the beginning, awareness in the end, and hiddenness in the middle, there is oleh veyored ("sliding scale") liability. [("Wherever there is awareness, etc.":) This refers to "Awarenesses of uncleanliness" (above). Since their provisions are few, they are adduced first, after which oaths are adduced, their provisions being many. And the yetzioth (of Shabbath) and observations (of plague-spots) are treated individually in their respective tractates, for which reason they are not discussed here. They are included here (above) only because they are similar to the others in being "two which are four." ("awareness in the beginning":) awareness that he has become unclean. ("awareness in the end":) After eating the sanctified food in "hiddenness" or entering the sanctuary in "hiddenness" and leaving, it becomes known to him that he ate or entered in uncleanliness. ("and hiddenness in the middle":) When he eats the sanctified food, his uncleanliness or its being sanctified food is hidden from him. Or he enters the sanctuary, and his uncleanliness or its being the sanctuary is hidden from him. ("oleh veyored liability":) "oleh" ("rising") for a rich man; "yored" ("descending") for a poor man. A rich man brings a beast sin-offering, and a poor man, a bird sin-offering; and the poorest of the poor, a tenth of an ephah (of flour), the "sinner's meal-offering" mentioned in many places.] Where there is awareness in the beginning and not at the end, the he-goat [of Yom Kippur] which is presented within [i.e., whose blood is presented within (the holy of holies)] and Yom Kippur suspend (his judgment) [protecting him from affliction] until he becomes aware [of having eaten sanctified food in a state of uncleanliness], whereupon he brings an oleh veyored offering.
Jerusalem Talmud Horayot
It is sinful to bring an animal into the Temple precinct which is not dedicated as a sacrifice. For voluntary offerings this presents no problem; one simply has to dedicate them when bringing. But for obligatory offerings it implies that a sacrifice may be presented only if all conditions which make it obligatory are actually fulfilled. They only are liable23To bring the sacrifice. for something24An official ruling by the Court. that was clear to them and then covered from them25They forgot either a precedent or their own ruling.. What is the reason? something was hidden26Lev. 4:13. An erring High Priest (Lev. 4:1–12) or ruler (22–26) have to offer a sacrifice if they err inadvertently; the condition that a ruling must have been forgotten is introduced only for the Court., something that was clear to them and then hidden from them. 27There is no problem with the explanation just given. One tries to connect the statement with a discussion about similar rules regarding sacrifices due for violations of either Temple purity or oaths (Lev. 5:1–13), where the same condition in mentioned in Lev. 5:2,3,4. R. Ismael and R. Aqiba differ in Ševuot 1:2 about the interpretation of the verses, but not about the actual rules. In the opinion of Rebbi Ismael who said, it became hidden from him, therefore he had known, and he knew28Lev. 5:4: …an oath which a man would utter without thinking, it became hidden from him, and he knew and realized his guilt …, these are two knowledges29One when he uttered the oath and one when he remembered it, separated by a period of oblivion.. In the opinion of Rebbi Aqiba who said, it became hidden, it became hidden, two times30R. Aqiba and R. Ismael actually are not differing in their interpretations; only R. Aqiba argues about violations of Temple purity (Lev. 5:2–3) where in both verses oblivion is mentioned but not remembering. However, in Babylonian sources [Ševuot 14b, Keritut 19a, Sifra Wayyiqra 2, Pereq 12(7)], R. Ismael is reported to read one about oblivion the impurity and the second oblivion about being in the Temple., therefore he had knowledge at the beginning and knowledge at the end and oblivion in between, 31Returning to our topic, Note 22. something that was clear to them and then hidden from them.