Tosefta for Challah 3:8
הַנּוֹטֵל שְׂאֹר מֵעִסָּה שֶׁלֹּא הוּרְמָה חַלָּתָהּ וְנוֹתֵן לְתוֹךְ עִסָּה שֶׁהוּרְמָה חַלָּתָהּ, אִם יֶשׁ לוֹ פַרְנָסָה מִמָּקוֹם אַחֵר, מוֹצִיא לְפִי חֶשְׁבּוֹן. וְאִם לָאו, מוֹצִיא חַלָּה אַחַת עַל הַכֹּל:
One who takes leaven out of dough from which <i>Challah</i> had not been removed and puts it into dough from which <i>Challah</i> had been removed: if one has a supply [of dough] from another place, one can take out [<i>Challah</i>] in accordance with the precise amount; but if one does not, one takes out one [portion of] <i>Challah</i> for the whole [dough].
Tosefta Demai
Vegetables of chullin that are cooked in untithed oil, behold, this is forbidden in any amount. If he has a supply in another place, he can take it out according to the precise amount (Hallah 3:8), and if not, [as to] something that [can be] mixed in [with oil], he mixes it and takes [the precise amount], and [as to] something that cannot be mixed [with oil], he takes from that [very] stalk or cut or egg.
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