YYoreh deʻahYoreh deʻahde Jacob ben Asher, Moses ben Israel Isserles, David ben Samuel ha-Levi, Shabbetai ben Meir ha-Kohen, Ezekiel ben Judah LandauMateriasJewish lawJewsDietary lawsMilk and meat (Jewish law)Kashering of meatMixture of permitted and forbidden foods (Jewish law)