ד שְׁנֵי עוֹרוֹת יֵשׁ לַוֵּשֶׁט, נִקַּב אֶחָד מֵהֶם, כְּשֵׁרָה; נִקְּבוּ שְׁנֵיהֶם, אֲסוּרָה, וַאֲפִלּוּ עָלָה בּוֹ קְרוּם וְנִסְתַּם, וַאֲפִלּוּ נִקְּבוּ זֶה שֶׁלֹּא כְּנֶגֶד זֶה, אֲסוּרָה; וְהוּא שֶׁנִּקְּבוּ שְׁנֵיהֶם מֵרוּחַ אֶחָד, דְּאֶפְשָׁר דְּמִתְרְמֵי אַהֲדָדֵי. (פֵּרוּשׁ שֶׁמִּזְדָּמְנִים לְהִתְכַּוֵּן יַחַד). (בֵּית יוֹסֵף בְּשֵׁם רִיטְבָ"א). הַגָּה: וְכָל זֶה לֹא מַיְרֵי אֶלָּא בְּנִכָּר שֶׁהַנֶּקֶב בָּא מֵחֲמַת חֹלִי, אֲבָל אִם יֵשׁ לָחוּשׁ שֶׁנִּקַּב עַל יְדֵי קוֹץ, אֲפִלּוּ לֹא נִקַּב רַק הַפְּנִימִי, טְרֵפָה, דְּחַיְשִׁינָן שֶׁמָּא נִקַּב גַּם הַחִיצוֹן, וּוֵשֶׁט אֵין לוֹ בְּדִיקָה מִבַּחוּץ. (בֵּית יוֹסֵף בְּשֵׁם תּוֹסָפוֹת וְהָרֹא"שׁ וְר"ן וְעוֹד פּוֹסְקִים).
4 The gullet has two skins. If one of them is punctured, it is valid. If both of them are punctured, it is forbidden, and even if a membrane formed [on the hole] and closed it up, and even if the holes are not opposite each other, it is forbidden. And that is when the two [holes] punctured from the same side [of the gullet], since then it is possible that they happened together (meaning: that they might align together) (Beit Yosef in the name of the Ritva) Rema: And all this is only dealing with a case where it's apparent that the hole came on account of an illness, but if there is concern that the hole is on account of a thorn, even if only the inner [skin] was punctured, it is an invalid animal since we're worried that maybe also the outer [skin] was punctured, and the gullet can not be checked from the outside.(Beit Yosef in the name of Tosafot, Rosh and Ran