Kosher

Definition and stakes

Portrait of Yechiel Michel Epstein Yechiel Michel Epstein,  Translation:Arukh ha-Shulchan…

“ Section 57 It is therefore no wonder that the accepted practice in our city is not to bring meat from outside the city, and in fact we consider non kosher (‘Trief’) meat and utensils brought from outside, though outside the city they are permitted. This is custom found in many locales, and it is a proper way to protect from many potential problems, as is well known. This of course requires an explicit enactment that prohibits all meat from outside, considering it non-kosher. ”
Source: Wikisource

Yosef Karo,  Shulchan Aruch — 118 Laws of sealing food and how to send it with a gentile

“ A Jew and a non-Jew that share together two pots, one by the other, this one for kosher meat, this one for non-kosher meat, this is permitted, and we are not concerned that perhaps when the Jew returns, the non-Jew will have switched kosher and non-kosher , even if the Jew's meat is better, and even if he vocalizes that it is better, it is permitted, and we are not concerned that perhaps they will splash and spill into one another. ”
Source: Wikisource

Yosef Karo,  Shulchan Aruch — Yoreh Deah 2 Whether slaughter performed by a non-Jew or a mumar…

“ Seif 2 A mumar/ wanton sinner who eats nevelot deliberately, a Yisrael can check the knife and give him it, then it's permitted to eat from his shechita, even if he shechts just for himself. Provided he knows the laws of shechita. But if he did not check for him the knife initially, it's forbidden to eat of his shechitah until he checks it afterwards. And he should not be given to shecht initially even with a kosher person standing over him without checking [the knife] for him [but just relying that] the knife is kosher based on checking it afterwards. ”
Source: Wikisource

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