Mishnah Taharos 5:3: Two paths, one impure and one pure, if someone walked down one of them and prepared pure things [i.e. pure terumah foods] and they were eaten, and then he [was] sprinkled [i.e. with the sanctified waters, as part of the red heifer purification process], and [then sprinkled] a second time, and he immersed and became pure, and then he walked down the second path and prepared pure things, they are pure. If the first ones still exist they are both held in suspension [and can be neither eaten nor burned]. If he did not purify [himself] in between, the first ones are in suspension and the second ones should be burned.

שְׁנֵי שְׁבִילִים, אֶחָד טָמֵא וְאֶחָד טָהוֹר, הָלַךְ בְּאַחַד מֵהֶם וְעָשָׂה טָהֳרוֹת וְנֶאֱכְלוּ, הִזָּה וְשָׁנָה וְטָבַל וְטָהַר, וְהָלַךְ בַּשֵּׁנִי וְעָשָׂה טָהֳרוֹת, הֲרֵי אֵלּוּ טְהוֹרוֹת. אִם קַיָּמוֹת הָרִאשׁוֹנוֹת, אֵלּוּ וָאֵלּוּ תְּלוּיוֹת. אִם לֹא טָהַר בֵּינְתַיִם, הָרִאשׁוֹנוֹת תְּלוּיוֹת וְהַשְּׁנִיּוֹת יִשָּׂרֵפוּ:

Mishnah Taharos 5:4: If a vermin and a frog are in the public domain, and someone touched one of them and then prepared pure things, and they were eaten, and he then immersed, and then touched the second one and prepared pure things, these [latter] things are pure. If the first ones still exist then both [sets] are held in suspension [and can be neither eaten nor burned]. If he did not immerse in between, the first ones are in suspension and the second ones should be burned.

הַשֶּׁרֶץ וְהַצְּפַרְדֵּעַ בִּרְשׁוּת הָרַבִּים, נָגַע בְּאַחַד מֵהֶם וְעָשָׂה טָהֳרוֹת וְנֶאֱכְלוּ, טָבַל, נָגַע בַּשֵּׁנִי וְעָשָׂה טָהֳרוֹת, הֲרֵי אֵלּוּ טְהוֹרוֹת. אִם קַיָּמוֹת הָרִאשׁוֹנוֹת, אֵלּוּ וָאֵלּוּ תְּלוּיוֹת. אִם לֹא טָבַל בֵּינְתַיִם, הָרִאשׁוֹנוֹת תְּלוּיוֹת וְהַשְּׁנִיּוֹת יִשָּׂרֵפוּ: