Tosefta sobre Demai 5:3
הַלּוֹקֵחַ מִן הַנַּחְתּוֹם, מְעַשֵּׂר מִן הַחַמָּה עַל הַצּוֹנֶנֶת, וּמִן הַצּוֹנֶנֶת עַל הַחַמָּה, אֲפִלּוּ מִטְּפוּסִין הַרְבֵּה, דִּבְרֵי רַבִּי מֵאִיר. רַבִּי יְהוּדָה אוֹסֵר, שֶׁאֲנִי אוֹמֵר, חִטִּים שֶׁל אֶמֶשׁ הָיוּ מִשֶּׁל אֶחָד, וְשֶׁל הַיּוֹם הָיוּ מִשֶּׁל אַחֵר. רַבִּי שִׁמְעוֹן אוֹסֵר בִּתְרוּמַת מַעֲשֵׂר, וּמַתִּיר בְּחַלָּה:
Quien compra a un panadero puede separar los diezmos del calor para el frío y del frío para el calor, incluso de muchos moldes, las palabras del rabino Meir. El rabino Yehudah prohíbe, porque yo digo que el trigo de ayer era de un [hombre] y el de hoy era de otro. El rabino Shimon prohíbe con respecto a [la separación de] Terumat Ma'aser , pero permite con respecto a Jalá .
Tosefta Demai
[With respect to] one who buys vegetables from an outdoor market, behold, this one spends the entire day [deciding what produce to] select, and we need not be concerned; [however] it is forbidden for him to make up his mind [while holding the produce in one's hand but before purchasing it, see Dem. 3:2], [since] he cannot return it, because he needs to tithe, and he cannot tithe it, because [if he changes his mind and returns the produce to the seller] it will be short some quantity [because he has tithed it], and he cannot buy just one item [constituting priestly portion, while returning the rest (per Lieberman)], lest another [buyer] comes and buys [the returned portion], and [unwittingly] tithes already-tithed produce in exchange for untithed produce [see, e.g., Dem. 5:3].
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