12

Rambam in Yesodei HaTorah ch. 1 explicitly uses this as the source for the commandment to know of Hashem’s existence. יְסוֹד הַיְסוֹדוֹת וְעַמּוּד הַחָכְמוֹת לֵידַע שֶׁיֵּשׁ שָׁם מָצוּי רִאשׁוֹן. וְהוּא מַמְצִיא כָּל נִמְצָא. וְכָל הַנִּמְצָאִים מִשָּׁמַיִם וָאָרֶץ וּמַה שֶּׁבֵּינֵיהֶם לֹא נִמְצְאוּ אֶלָּא מֵאֲמִתַּת הִמָּצְאוֹ: וְאִם יַעֲלֶה עַל ...


5

Sefer Hachinuch counts this as Mitzvah 25. In short, the Mitzvah is belief in G-d. מצות האמנה במציאות השם - להאמין שיש לעולם אלה אחד, שהמציא כל הנמצא ומכחו וחפצו היה כל מה שהוא ושהיה ושיהיה לעדי עד, וכי הוא הוציאנו מארץ מצרים ונתן לנו את התורה. שנאמר בתחלת נתינת התורה (שמות כ ב) אנכי ה' אלהיך אשר הוצאתיך מארץ מצרים וגו'. ופרושו כאלו אמר תדעו ...


4

The following passage from R. Joseph B. Soloveitchik's "And Joseph Dreamt a Dream" limits the applicability of "not in heaven" to matters pertaining to law: We all know the story of the "oven of Achnai". When in the course of a Talmudic dispute, a legal discussion over a question of ritual impurity, R. Eliezer ben Hyrcanus tried to adduce miraculous ...


4

See Sefer Ha'aros from R' Elyashev z"l (Kesubos 11b) who suggests that it has practical ramifications, since the Heavenly court rules in accordance with the rulings of the earthly Beis Din. אולי משום שפוסקין למעלה כלמטה, וכדחזינן בפ' חלק (סנהדרין קד ב) לגבי שלמה המלך שבקשו וכו' ומנעום. See further discussion here (in Hebrew).


4

I don't see the stated problem here. Gasoline is a continuous fluid to more digits than we can actually measure with the comparatively crude instruments used in gas pumps. He's not selling a gallon of gas for 4.009; he's selling 10/4009 gallons for a penny. There's actually a worse problem that reached mild fame here in the US before dying away. Gas ...


3

In response to a question seeking Radbaz’s opinion as to what was so genius about King Solomon’s judgement (Resp. §1059), Radbaz considers from a halachic standpoint that one could advocate the opinion that a judge/court is permitted to remove an item from its possessor on the basis of circumstantial evidence (which King Solomon deduced). Alternatively, ...


2

The Chasam Sofer Kovetz Teshuvos 85 says that even though they did not know whether the Mekalel was Chayav Misa or not, they still warned him that he will die with Sekila which is the most severe death according to Rabanan just in case, and going like the opinion Sanhedrin 80b מותרה לדבר חמור הוי מותרה לדבר קל, they could subsequently have given the Mekallel ...


2

There is a whole section of the Rambam that deals extensively with proper conduct. https://www.sefaria.org/Mishneh_Torah%2C_Human_Dispositions.1?lang=bi


1

I really can't see an issue here. There's a discussion of a woman getting "a man's haircut", but that's not what this is. There is a Talmudic concept of chashad -- don't do things that will likely cause an average person to think you're violating the Torah, even though you aren't. One example is a house that faces two different streets -- back when ...


1

Yes. The 5th chapter of Maaser Sheini has both, immediately adjacent to each other. Maaser Sheini 5:10-14 gives laws of viduy maaser, and then Mishnah 15 says that at a particular time Yochanan Kohen Gadol said not to do it. Since 10-14 weren't practically applicable at the time of the mishnah, the implication is that they're universal whenever viduy ...


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