Reference for Zavim 5:9

הָאוֹכֵל מִנִּבְלַת עוֹף טָהוֹר וְהִיא בְּבֵית הַבְּלִיעָה, מְטַמֵּא שְׁנַיִם וּפוֹסֵל אֶחָד. הִכְנִיס רֹאשׁוֹ לַאֲוִיר הַתַּנּוּר, טָהוֹר, וְטָהוֹר הַתַּנּוּר. הֱקִיאָהּ אוֹ בְלָעָהּ, מְטַמֵּא אֶחָד וּפוֹסֵל אֶחָד. וּכְשֶׁהִיא בְתוֹךְ פִּיו, עַד שֶׁיִּבְלָעֶנָּה, טָהוֹר:

If one ate the carcass of a clean [kosher] bird and it is [still] in his gullet, he renders unclean at two [levels], and disqualifies [terumah] at one [level more]. [If] he stuck his head into the air-space of an oven [while the carcass it still in his gullet], it is clean [redundant words] and the oven is clean. [If] he spit it out or swallowed it, he renders unclean at one [level], and disqualifies [terumah] at one [level more]. But as long as it is [still] in his mouth until he swallows it, he is clean.

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