Terumos5: 6
סְאָה תְרוּמָה שֶׁנָּפְלָה לְפָחוֹת מִמֵּאָה, וְנִדְמְעוּ, וְנָפַל מִן הַמְדֻמָּע לְמָקוֹם אַחֵר, רַבִּי אֱלִיעֶזֶר אוֹמֵר: מְדַמַּעַת כִּתְרוּמָה וַדַּאי. וַחֲכָמִים אוֹמְרִים: אֵין הַמְדֻמָּע מְדַמֵּעַ אֶלָּא לְפִי חֶשְׁבּוֹן; וְאֵין הַמְחֻמָּץ מַחֲמִיץ אֶלָּא לְפִי חֶשְׁבּוֹן; וְאֵין הַמַּיִם שְׁאוּבִים פּוֹסְלִים אֶת הַמִּקְוֶה אֶלָּא לְפִי חֶשְׁבּוֹן.
[If] a seah of terumah fell into less than one hundred, creating a meduma mixture, and [then a portion] fell from the meduma mixture to another place, R' Eliezer says: It makes the [new] mixture meduma just as definite teru- mah would. But the Sages say: A meduma mix-ture does not make another mixture meduma except in proportion [to its terumah content]; and [a batch of dough] that was leavened [with terumah] does not render [another dough] leavened [with terumah] except in proportion [to its terumah content]; and drawn water does not disqualify a ritual bath except according to proportion.
Terumos5: 7
סְאָה תְרוּמָה שֶׁנָּפְלָה לְמֵאָה, הִגְבִּיהָהּ וְנָפְלָה אַחֶרֶת, הִגְבִּיהָהּ וְנָפְלָה אַחֶרֶת, הֲרֵי זוֹ מֻתֶּרֶת, עַד שֶׁתִּרְבֶּה תְרוּמָה עַל הַחֻלִּין.
[If] a seah of terumah fell into one hundred, [and] he lifted it out and another fell [in], [and] he lifted it [out] and another fell [in], it is permitted, until the terumah exceeds the chullin.