טהרות ט׳Tahorot 9

Mishnah 1א׳

זֵיתִים מֵאֵימָתַי מְקַבְּלִין טֻמְאָה. מִשֶּׁיַּזִּיעוּ זֵעַת הַמַּעֲטָן, אֲבָל לֹא זֵעַת הַקֻּפָּה, כְּדִבְרֵי בֵית שַׁמָּאי. רַבִּי שִׁמְעוֹן אוֹמֵר, שִׁעוּר זֵעָה שְׁלשָׁה יָמִים. בֵּית הִלֵּל אוֹמְרִים, מִשֶּׁיִּתְחַבְּרוּ שְׁלשָׁה זֶה לָזֶה. רַבָּן גַּמְלִיאֵל אוֹמֵר, מִשֶּׁתִּגָּמֵר מְלַאכְתָּן. וַחֲכָמִים אוֹמְרִים כִּדְבָרָיו:

Starting when are olives able to be rendered impure [by being primed for impurity by a liquid]? Once they sweat moisture in the vat [into which the olives are placed for them to soften for pressing], but not by moisture in the basket [into which they are placed after being picked], according to Beit Shammai. Rabbi Shimon says: the measure for sweat is three days [i.e. the moisture the olives sweat while in the vat does not prime them for impurity until they have been there for three days]. Beit Hillel says: when [they soften such that] three connect to one another [only then does the moisture that emerges from them prime them for impurity]. Rabban Gamliel says: once their work has been finished [i.e. once no more olives are being added to the vat, and they are ready to be brought to the olive press]; and the Sages say in accordance with him.

Mishnah 2ב׳

גָּמַר מִלִּמְסֹק אֲבָל עָתִיד לִקַּח, גָּמַר מִלִּקַּח אֲבָל עָתִיד לִלְווֹת, אֵרְעוֹ אֵבֶל, אוֹ מִשְׁתֶּה, אוֹ אֹנֶס, אֲפִלּוּ זָבִים וְזָבוֹת מְהַלְּכִים עֲלֵיהֶן, טְהוֹרִין. נָפְלוּ עֲלֵיהֶן מַשְׁקִין טְמֵאִין, אֵין טָמֵא אֶלָּא מְקוֹם מַגָּעָן, וְהַמֹּחַל הַיּוֹצֵא מֵהֶן טָהוֹר:

If one finished harvesting [his olives] but intends to buy, or finished buying but intends to borrow [more olives], if it happened that he became a mourner, or had a feast [to attend], or something unavoidable befell him [preventing him from getting more olives or pressing them], even if zavim and zavot [certain individuals with discharges that render them a Source of impurity] walk upon them [i.e. upon the olives he already had] they remain pure [as they have not become primed for impurity]. If impure liquids fell on them, only the area they touched is impure, and the sap that emerges from them is pure.