The Mnemonic: פמג׳׳ש ממקגט׳׳י ככסע׳׳ז
1). פירות מפוזרין Scattered fruit location
2). מעות מפוזרות Scattered coins human action
3). עיגולי דבילה Fig cakes weight
4). לשונות של ארגמן Strips of purple wool value
5). המוצא מעות בבתי כנסיות One who finds coins in synagogues (and highly trafficked spaces) human action+(tosafot: whether or not an item has an identifying mark)
6). מאימתי כל אדם מותרים בלקט From when does leket become permitted to everyone? location of those who might have claim to it
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7). קציעות בדרך ואפילו בצד...מותרים Dried figs found on a path, even on its side...are permitted
8). הגנב שנטל מזה ונתן לזה The thief who takes from one person and gives to another
9). שטף נהר The river took...
10). כיצד אמרו התורם שלא מדעת In what way? The rabbis said that one who takes terumah without an owner's consent...
At the time he separated terumah, he did not know [that the owner would have agreed to separation of the higher quality produce]
Therefore, since when he [i.e., the owner] did find out, it was pleasing to him, we say that from the outset it was pleasing to him.
And this is true also as this pertains to yeush: Since when he finds out, he despairs of ownership, also from the outset he has despaired.
Rabbi Eliyahu ben Shlomo Zalman
Vilnius, Lithuania 1720-1797
"So too it is reasonable..."
Nota bene: Rambam's manuscript says "Do you really maintain that opinion? Rather, the verse states 'you'..."
And he means to say: Why does the Mishna need to say [that the master says to the agent]: "Go to the better quality produce, is the agent not like the master in all respects?! Rather, what are we dealing with here? A case where the master appointed him as his agent."
And all of this is a resolution against a challenge to Rava here.
But we do not need all of these challenges here because when we are dealing with a mitzva matters of yeush are different. See my note on Kiddushin 52b...
We have this version: "So too it is reasonable..." And we do not have "Do you really maintain that distinction?..." [i.e., Rambam's text].
(כז) וְנֶחְשַׁ֥ב לָכֶ֖ם תְּרוּמַתְכֶ֑ם כַּדָּגָן֙ מִן־הַגֹּ֔רֶן וְכַֽמְלֵאָ֖ה מִן־הַיָּֽקֶב׃ (כח) כֵּ֣ן תָּרִ֤ימוּ גַם־אַתֶּם֙ תְּרוּמַ֣ת יְהֹוָ֔ה מִכֹּל֙ מַעְשְׂרֹ֣תֵיכֶ֔ם אֲשֶׁ֣ר תִּקְח֔וּ מֵאֵ֖ת בְּנֵ֣י יִשְׂרָאֵ֑ל וּנְתַתֶּ֤ם מִמֶּ֙נּוּ֙ אֶת־תְּרוּמַ֣ת יְהֹוָ֔ה לְאַהֲרֹ֖ן הַכֹּהֵֽן׃
(27) This shall be accounted to you as your gift. As with the new grain from the threshing floor or the flow from the vat, (28) so shall you [all] on your part set aside a gift for יהוה from all the tithes that you receive from the Israelites; and from them you shall bring the gift for יהוה to Aaron the priest.
תְּרוּמָה Terumah
Deuteronomy 18:4 commands that "the first fruits of your corn, your wine, and of your oil" be given to the priest (see also Numbers 18:12). The Sages extended the scope of this commandment to include all produce. This mitzvah only applies in Eretz Israel...The Torah does not specify the amount of terumah that must be set aside; may may theoretically fulfill the obligation by giving even a single kernel of grain from an entire crop. The sages established a measure...
excerpted from Steinsaltz Reference Guide
שְׁלִיחוּת Agency
The apointment of an agent to perform an act on behalf of the person who appointed him. The rule is that the agent of a person is like the person himself. The agent can substitute for his principle in most legal matters...Agency can be affected only with the principles conscious consent.
excerpted from Steinsaltz Reference Guide
Ameimar
Amoraim - Fifth And Sixth Generations
c.350 – c.425 CE
Amemar was a contemporary of Rav Ashi and is often quoted in discussion with him. He established the academy in Nehardea under his leadership, was the head of that city's court and was honored by the Persian monarchy.
Mar Zutra
Amoraim - Sixth Generation
c.375 – c.425 CE
Mar Zutra was a prominent student of Rav Pappa and eventually became the head of the academy in Pumbedita. He was a colleague of Rav Ashi and Amemar and, like them, was on good terms with the Persian monarchy.
Rav Ashi
Amoraim - Sixth Generation
c.375 – c.425 CE
Rav Ashi studied under the students of Abaye and Rava and became head of one of the academies at age fourteen. He continued in that position for sixty years and was the dominant Jewish religious leader of his time. Taking advantage of the tolerance of Shapur II's successors, he collected all the preserved explanations of the Mishnah and its parallel works. This laid the groundwork for the Babylonian Talmud.
Marei bar Isak
Amoraim - Sixth Generation
Grandson of Rabbi Yirmiah bar Abba