Tosefta for Tahorot 9:4
הַגּוֹמֵר אֶת זֵיתָיו וְשִׁיֵּר קֻפָּה אַחַת, יִתְּנֶנָּה לְעָנִי הַכֹּהֵן, דִּבְרֵי רַבִּי מֵאִיר. רַבִּי יְהוּדָה אוֹמֵר, יוֹלִיךְ אֶת הַמַּפְתֵּחַ מִיָּד. רַבִּי שִׁמְעוֹן אוֹמֵר, מֵעֵת לְעֵת:
One who finishes [harvesting] his olives, but leaves one remaining basket [and does not put it in the vat], he should place it in [the vat] before the eyes of a priest [i.e. so the priest can observe it as it is primed for impurity, and ensure that it does not become impure], according to Rabbi Meir. Rabbi Yehuda says: he should bring the key [to his olive press to a priest] immediately [but the priest does not have to be observing the whole time]. Rabbi Shimon says: [he should bring him they key] from hour to hour [i.e. bringing the key within twenty-four hours is sufficient].
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