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Inspired by this question ( SE Challenge: Halachot in which rulings range from permissible to Torah violation?) , I thought I'd go further. Can you think of any Halachoth whose rulings range from obligatory to a (Torah) prohibition?

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What do you mean by "Torah" (only mid'oraysa or just Torah as opposed to, e.g., New York State law), and what do you mean by your parentheses? –  msh210 Nov 25 '11 at 19:26
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@msh210, I meant the former. The parentheses are to imply that it might be easier to find things that are prohibited MiDeRabanan, but +1 if it's MiDeOraitha. –  Seth J Nov 27 '11 at 5:59
    
Are you including talmudic arguments, or only contemporary ones? –  YDK Dec 30 '11 at 16:44
    
@YDK, I'm interested in all cases, but I'm particularly interested in cases that are still subject to dispute. –  Seth J Dec 30 '11 at 18:19
    
@SethJ See comments on the newest answer and consider clarifying the question post. –  Double AA Jun 26 at 4:03

4 Answers 4

Easy. Just take any halacha whose rulings range from permissible to forbidden and have a parent ask you to do it.

For example: If a parent asked you to carry something on Shabbos within an eruv in a large city. One opinion would be that you must do it because of kibbud av v'em. The other opinion would say it's assur, and that you are required to disobey your parent.

The same would apply if a parent asked you to shave, smoke, or open an umbrella on Shabbos.

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+1, but accepting this is out of the question. This answer is (kind of) a cop out. –  Seth J Oct 4 '13 at 18:56

One will certainly find posters in Israel claiming that it is both prohibited (Biblically?) to vote, and obligatory (Biblically?) to do so.

While you'll occasionally meet a Jew who refrains from consuming grain grown after last Passover (chadash/ yashan), Rabbi Michel Shurkin is said to prohibit it in Israel as the risk of insect infestation is too high.

Similarly, applying oral suction after circumcision is something some communities consider obligatory, others ban for health reasons.

But all of these involve more considerations than a single point of dispute in halacha.

Many prohibit shaving on Chol HaMoed; Rabbi Joseph Soloveichik told those students who asked him, if they would follow his opinion, that they were obligated to do so out of honor for the holiday.

Of course the easiest way to find a bona-fide matter where the opinions range from prohibited to obligatory is where the obligation is overriding an otherwise-prohibited situation. The opening Mishna in Yevamot construes a case whereby the House of Shammai says this woman is obligated to either marry this man or perform a chalitza ceremony, with marriage being the Biblically-preferred choice. The House of Hillel maintains in such a case that marriage would be prohibited.

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+1 for tzaras habas. First thing I thought of when I read the question. –  Alex Nov 25 '11 at 20:54
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IN Israel, everyone agrees that Chadash (grain planted after pesach) is forbidden. Even in chutz la'aretz, it is unreasonable to insist on eating something that almost all rishonim prohibit. –  Ariel K Dec 19 '11 at 3:49
    
Many of these topics are very controversial, which may make people exaggerate their claims for polemical reasons. E.g. I don't think the Torah discusses voting. –  Ariel K Dec 19 '11 at 3:51
    
+1 overall, especially the last paragraph. –  Seth J Dec 30 '11 at 18:17

Following on Shalom's answer, any case where one principle is overriding another. If two people disagree as to whether an ailment requires driving to the hospital on Shabbat (or otherwise violating Shabbat or Yom Tov), that would put one side as: you must and the other as assur min hatorah. A borderline case of murder/idolatry/sexual immorality could have a machloket between "you must 'sin' to save your life" or "you must die rather than sin".

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Good answer. I think it must generally be a situation in which competing Halachoth need to be evaluated to determine which overrides which. –  Seth J Dec 30 '11 at 18:18

Here are two cases from the halachos of bread. Both stem from the halacha that if you eat bread and are full, you have a Biblical mitzvah to say a concluding blessing according to all opinions, and are assuming that an incorrect blessing is a Biblical prohibition of taking Hashem's name in vain.

If you make normal dough, and then instead of baking it fry it in oil, it is a dispute between Rabbeinu Tam and the Rash if eating a meal of it gives it the status of bread. Rabbeinu Tam holds that it is bread, and the Rash holds it cannot become bread. If you eat your full of it, Rabbeinu Tam would tell you that you have a Biblical obligation to recite Birkas HaMazon, and the Rash would tell you that you have transgressed taking Hashem's name in vain multiple times.

There is a three-way dispute what qualifies as Pas Haba B'kisanin. 1 - Something in which the dough was filled with sweets or fruit. 2- Something dry and hard. 3 - Something in which the dough was made with non-water liquids. According to most opinions (the only exceptions of which I am aware are the Nesivos in his introduction to the Hagaddah and the Ma'amar Mordechai) these explanations are mutually exclusive. Therefore, what qualifies according to one opinion as Pas Haba B'kisanin is not Pas Haba B'kisanin according to the other two, and is rather ordinary bread. The halacha of Pas Haba B'kisanin is that if you eat the amount that a person would normally eat as a meal, you make Hamotzi and Birkas HaMazon, but otherwise you make a Mezonos and Al Hamichya. That being said if you eat any food which satisfies at least 1 but not all 3 types of Pas Haba B'kisanin, and you eat enough that you personally are full but not the amount which makes a normal meal, according to the opinions that you ate normal bread you have a Biblical obligation to say Birkas HaMazon, and according to the opinions that you ate Pas Haba B'kisanin you have a Biblical prohibition to say Birkas HaMazon.

(Extensive sourcing to follow when I have my notes available)

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You may need to justify/flesh out a few things here when you add the sources: Saying the wrong after-bracha is an issue Min HaTorah, that the distinction in Pas Haba B'kisanin is Min HaTorah, and that the Rash is holding that it is not even Pas Haba B'kisanin. –  Yishai Jun 25 at 21:27
    
@Yishai the first point I made reference to. The distinction of Pas Haba B'kisanin has to be from the Torah as a matter of cheshbon, otherwise the Rabbis are creating a blessing to override and nullify a Biblical blessing (Pri Megadim makes this point). And the Rash says you never bench no matter how much you eat, so it is clearly not PHB. –  YEZ Jun 25 at 21:35
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@YEZ Not all agree with that Peri Megadim IIRC R Akiva Eiger argues. –  Double AA Jun 25 at 21:45
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@DoubleAA, that didn't apply here –  Yishai Jun 25 at 22:50
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@DoubleAA I don't have any indication that this question has such a standard. It is inspired by that question, not continued from it. If he wants such a standard, he can put it in his question. –  YEZ Jun 26 at 12:42

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