[Our Sages]1 taught: Rabbi [Yehudah HaNasi] said, “{It is written,2} ‘You shall slaughter from your cattle and your herds as I commanded you.’ This teaches that Moshe was commanded regarding the laws of ritual slaughter orally (see Perishah3 1:1), for where was he [so] commanded in the Written [Torah]? Rabbi Yehudah said4 {in the name of Shmuel}, “It is forbidden to eat meat [from an animal slaughtered by] any shochet who does not know the laws of ritual slaughter. [The fundamental] laws [that disqualify ritual slaughter] are:5 Interrupting [the slaughter,] pressing [the knife against the animal’s neck during the slaughter], concealing [the knife under the windpipe or the gullet in the course of an inverted slaughter,] diverting [the knife from the place of slaughter,] and ripping [the simanim from their place before cutting them,]” as will be delineated in section 23. תַּנְיָאא רַבִּי אוֹמֵר וְזָבַחְתָּ מִבְּקָרְךָ וּמִצֹּאנְךָ כַּאֲשֶׁר צִוִּיתִךָב מְלַמֵּד שֶׁנִּצְטַוָּה מֹשֶׁה עַל הִלְכוֹת שְׁחִיטָה בְּעַל פֶּה (עַיֵּן פְּרִישָׁהג ) דְּהֵיכָן צִוָּהוּ בִּכְתָב.ד וְאָמַר רַב יְהוּדָה אָמַר [שְׁמוּאֵל]ה כָּל טַבָּח שֶׁאֵינוֹ יוֹדֵעַ הִלְכוֹת שְׁחִיטָה אָסוּר לֶאֱכוֹל מִשְּׁחִיטָתוֹ וְאֵלּוּ הֵן הִלְכוֹת שְׁחִיטָה שְׁהִיָּה דְּרָסָה חֲלָדָה הַגְרָמָה וְעִקּוּר כְּדִלְקַמָּן סִימָן כ”ג: