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If the main characters are actually Jewish and they're just adhering to Jewish customs, I'm not sure that's a Trope. There are things like Informed Judaism and Ambiguously Jewish for when there's some funny business going on, but "An actual Jew follows actual Jewish customs" is very People Sit on Chairs. You can maybe make an argument for Shown Their Work if it's very comprehensive, but not if it's within normal behavior.
Depending on the nature of the story, like if Emperor Evulz is attempting to conquer the world with his Army of Doom, yet still observes the Shabbat so that the Jewish protagonist doesn't have to break any Jewish customs in order to fight Emperor Evulz, you might argue for Even Evil Has Standards or Everyone Has Standards. "Sure, I'm trying to conquer the world with an iron fist, but I'm not a monster."
Edited by KDAuthor Tract is at least related. If it's Religious Edutainment, well, I can't find anything more specific than Author Tract. Also, as said above, if the setting and characters are such that adhering to Jewish customs is expected (it's a historical novel set in ancient Israel or a Karaim village, or a modern novel set in a kibbutz, or something like that; and the plot isn't about rebelling against these customs) this is People Sit on Chairs.
Edited by Veanne

A particular series was written by a Jew; in this series, there is no mention of non-Kosher food (Kosher meaning that it's religiously permissable to eat) and no events happen on Shabbat (from Friday shortly before dark until Saturday after dark, when many normal activities such as travel and use of electricity are religiously forbidden).