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A Canaanite slave (who's mother is Canaanite and father is foreign) is obligated in all negative Mitzvot which includes keeping Shabbos just like a Jewish woman (and some positive Mitzvot including Kiddush Bentching eating matza and Korban Pesach). He cannot become a slave to a Jew unless he fully accepts the Mitzvot and has to do Mila (circumsision) ...


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Both Hebrew and non-Jewish slaves must observe Shabbos: THe Hebrew slave is not actually a slave, he's a full-time employee, so he's obligated in all Mitzvos including 3 daily prayers and keeping Shabbos. Non-Jewish slaves are considered an "extension" of their Master's souls and are obligated to keep Shabbos (to a certain extension) as the verse says (...


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Rambam, Hilchos Kiddush Hachodesh 17:24 (after spending several chapters on the details of astronomical calculations): וטעם כל אלו החשבונות ומפני מה מוסיפים מנין זה ומפני מה גורעין. והיאך נודע כל דבר ודבר מאלו הדברים. והראיה על כל דבר ודבר. היא חכמת התקופות והגימטריות שחברו בה חכמי יון ספרים הרבה והם הנמצאים עכשיו ביד החכמים... שכל דבר שנתגלה טעמו ונודעה ...


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Bereishis Rabbah 14:2: בָּעוֹן קַמֵּיהּ דְּרַבִּי אַבָּהוּ, מִנַּיִן שֶׁהַנּוֹצָר לְשִׁבְעָה חַי, אֲמַר לְהוֹן מִדִּידְכוֹן אֲנָא מַמְטֵי לְכוֹן, זיט"א אפט"א, איט"א אוכט"א. [Some people] asked R’ Avahu: “From where do you know that a fetus born at seven months can live?” He said to them, “From your own [language] I will respond to you: zeta [the ...


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Megilat Aicha tells us: "If someone tells you, 'There is wisdom among the Goyiim, you can beleive that... " This is copied off the internet: In the Book of Lamentations, the prophet describes the situation of the people of Israel after the destruction of the Temple:" ... A queen and her ministers are among the nations, there is no Torah, Even its prophets ...


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The Gemara (Eruvin 100b) states: אמר רבי יוחנן אילמלא לא ניתנה תורה היינו למידין צניעות מחתול וגזל מנמלה ועריות מיונה דרך ארץ מתרנגול R Yochanan said: Even if the Torah were not given, we would have learnt modesty from a cat, [that it is wrong to] steal from a ant, forbidden relations from a dove, and regular relations from a rooster The Gemara is ...


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Indeed different Rabbis interpret it differently, hence the difference in translations, for the list of commentaries see here. For example, Ebn Ezra: "כי המרו את רוחו - שב אל השם, כמו והמה מרו ועצבו את רוח קדשו.", also Metzudat David: "כי המרו. כי ישראל מרו בדבר ה׳‎:" but "ויבטא. ודבר משה בשפתיו לקרותם ממרים", also Rada"k "ויבטא בשפתיו. האל יתברך שלא יכנסו ...


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The Tanya uses the word rasha and beinoni in different ways than most of us. When this is understood, it becomes clearer that the Tanya actually is a manual for how to become a beinoni. In the language of the Tanya, the beinoni is at a very high level but a realistic target (from this introduction to Tanya) a person who exercises complete self-control ...


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The gemara in Shabbos 85a tells us that Chazzal had a tradition going back to biblical times of knowledge they learned from various nations concerning plant growth, namely how far they need plant various species to avoid Kilaim. וקים להו לרבנן דחמשא בשיתא לא ינקי מהדדי And the Sages have an accepted tradition that five seeds in a six-handbreadth ...


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This is not a specific work, but an example of using secular knowledge for Torah: Sanhedrin 5b והאמר רב שמונה עשר חדשים גדלתי אצל רועה בהמה לידע איזה מום קבוע ואיזה מום עובר But did not Rab himself say: I spent eighteen months with a shepherd in order to learn which was a permanent and which a passing blemish?


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The Chumash describes how the Jews used secular poetry to determine which lands previously owned by Moav they were allowed to conquer. (I'm assuming that when you said Tanaim, Amoraim, Rishonim, Achronim, it was lav davka and you weren't intending to exclude earlier sources.)


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R Gil Student writes here that R Gedaliah Felder was opposed to Jews being vegetarians because this attitude comes from gentile sources and contradicts the spirit of Judaism. Therefore, adopting ideological vegetarian attitudes violates the prohibition against following gentile practices. See the original for the full Hebrew text of his responsa.


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The gemara in Moed Kattan 18b would seem to advise against it: כי הא דרבא שמעיה לההוא גברא דבעי רחמי ואמר תזדמן לי פלניתא א"ל לא תיבעי רחמי הכי אי חזיא לך לא אזלא מינך ואי לא כפרת בה' בתר הכי שמעיה דקאמר או איהו לימות מקמה או איהי תמות מקמיה א"ל לאו אמינא לך לא תיבעי עלה דמילתא This is like this incident, in which Rava heard a certain man asking for ...


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This sounds like something only Elon Musk would be concerned. In Judaism, we are obligated to rely on our senses, not magic or false prophets. It is with the help of our faculty and abilities that we should determine that the voice in question (in any given conversation) is simply an act of AI, and not a divine agency. This is because the brain perceives ...


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