The gemara in brachos 10a says that Chizkiyahu made the decision not to have children as he saw that his kids would be negative influences on the Jewish people. Then, Yeshayahu tells him that is not for Chizkiyahu to worry about God's secrets; he must simply do that which he is commanded.

The gemara in other places, one of them being Horayos 10b, talks about the concept of 'Aveira lishma'. The gemara says that when Yael did the aveira with Sisra, it was OK because it was done for the right reason. It seems to make a similar point about Tamar's acting like a prostitute in order to have children with Yehuda.

It seems to me that there is a contradiction here. Is it permissible to make a decision that contradicts Halacha because it is for the greater good (I.e. aveira lishma) or not (as implied by the Chizkiyahu story)?

(I note that the Tamar story was pre-Sinai and I can't work out if Yael was Jewish. This may be the answer; you can't make this decision as a fully fledged Jew. However, the gemara in Horayos sounds like it is a more general rule.)

  • See R Lichtenstein's Leaves of Faith Vol 2 Chap 2, especially fn 25. The concept of Aveira Lishmah has essentially no practical implications.
    – Double AA
    Commented Aug 8, 2018 at 12:15
  • Great question, I answered a similar one very thoroughly here judaism.stackexchange.com/a/87291/15579. Tell me if it is not sufficient, please.
    – Al Berko
    Commented Aug 8, 2018 at 12:19
  • Yael seems to be Jewish. She was married to a descendant of Yisro.
    – DonielF
    Commented Aug 8, 2018 at 14:53
  • @Doniel did all of his children convert?
    – Double AA
    Commented Aug 8, 2018 at 15:20
  • @DoubleAA Rashi says that he went to convert his family, and we’re told all over Tanach of descendants of his who are Jewish. It’s not clear to me whether he was successful with all of them, but it clearly wasn’t just Tzipporah.
    – DonielF
    Commented Aug 8, 2018 at 15:46

2 Answers 2


This topic is dealt with extensively by Rav Asher Weiss on his website. The following is a summary.

To begin with, two major authorities have already said that today there is no practical application of Chazal's dictum גדולה עבירה לשמה: The Ramchal (Kinas Hashem Tzevakos II ענין יעל) and Rav Chaim Volozhin (As pointed out by @Alex, in Keser Rosh § 132). The former wrote this to negate the behavior of those who still followed Shabtai Zvi ימ"ש and broke the Torah, using this dictum as justification.

Rav Asher Weiss understands Tosafos and the Ran to Sanhedrin 74b to be saying that a woman's passive participation in forbidden relations (קרקע עולם) isn't a blanket permit, rather it's just an excuse why she doesn't have to give up her life. Yael on the other hand, actively engaged in forbidden relations with Sisera. Therefore, you have to say that since it was to save the entire Jewish people, it was permitted.

In fact, the Maharik (Teshuvos § (167)[165]) says explicitly that forbidden relations are permissible when the reason it to save the entire Jewish people. He learns this from the behavior of Yael and Esther. He writes:

הנה דבר פשוט הוא כביעתא בכותחא כי אסתר לא עשתה שום איסור ולא היה בדבר אפילו נדנוד עבירה, אלא מצוה רבה עשתה כשהצילה כל ישראל וכו', וכן מצינו ביעל אשת חבר הקיני ששיבחה הכתוב במעשה דסיסרא וכו' ודבר זה מותר לעשות עבירה זו לשמה, אפילו היא אשת איש להציל את ישראל, וכן מצינו באסתר שהמציאה עצמה לאחשורוש בשעה שלא היה תובעה כדי שיתאוה לה, ויהיה נוח להתפתות לעשות לה כבקשתה

Behold, it's beyond obvious that Esther didn't do a single forbidden thing, not even a smidgen of transgression. Rather, she did a huge mitzvah, in that she saved the Jewish people...we find similarly with Yael, which the verse praises her [for her actions]. [We see] that it's permissible to perform this transgression with the right intent. Even a married woman can do this, to save the Jewish people. We find this with Esther, who made herself appealing to Achashverosh even when he didn't ask for her to come to him, in order to entice him. This way it would be easy for him to be seduced to listen to her request.

All we see from this though is to save the entire Jewish people, not an individual.

Rav Asher Weiss brings a huge novelty from the Beis Yaakov (Teshuvos § 39), who discusses a case of someone who threatened to kill a man unless he had forbidden relations with a married Jewish woman. A different woman in this group volunteered to have relations with this criminal if he would spare them all, and he accepted. The question was is this woman forbidden to her husband. The Beis Yaakov says that even though she volunteered, since there was an aspect of coercion, she's permitted. To avoid a contradiction between this and Esther, he innovates that Esther in the end wasn't forbidden to Mordechai. Besides disagreeing with his innovations (as does the Shevus Yaakov II § 117), Rav Asher Weiss sees from his words that the woman in this case committed no wrong, and it was only a question if she was forbidden to her husband. This is surprising, as it was a case of saving an individual.

In a similar case, the Shevus Yaakov (ibid) says even though the woman did properly, saving the life of everyone there by committing improper relations, she's forbidden to her husband. He invokes the actions of Yael and Esther and עבירה לשמה. We see another authority employing this idea, even when dealing with saving individuals. Rav Asher Weiss says the Ateres Chachamim (Even HaEzer § 29) writes similarly.

However, the Nodah BeYehudah (Yoreh Deah II § 161) writes that if a married woman volunteers to forbidden relations to save others, not only is she forbidden to her husband, but she committed the severe transgression of arayos. He says Esther was different because she was saving the entire Jewish people. Also, it was under the ruling of Mordechai and his Beis Din, and maybe it was through ruach hakodesh. Rav Asher Weiss learns from this that the only permit is through ruach hakodesh or a Beis Din with the power of the Anshei Kenesses HaGedolah, which have the power to uproot the Torah.

Rav Asher Weiss then examines the words of Chazal themselves. They didn't say גדולה עבירה לשמה as a permit to perform transgressions. Rather, it was an ex post facto (בדיעבד) praise of Yael's actions. Can we learn a permit at the onset (לכתחילה)? He sees from Yoma 69a that sometimes we can perform a transgression because of עת לעשות לשם. Shimon HaTzaddik wore the Kohen Gadol's clothing outside of the Temple Service when he greeted Alexander the Great, breaking the transgression of benefiting from them. He says the gemarra is clear the permit wasn't because of saving lives, but because of עת לעשות. Rashi (ad. loc.) even writes:

עת לעשות לה' - כשבא עת לעשות דבר לשמו של מקום - מותר להפר בו תורה"

עת לעשות לה'‏ - When a time comes to do something for the sake of Hashem, it is permitted to annul the Torah.

Rav Asher Weiss sees this as a permit to break the Torah, but only coming from a ruling of "gedolei hachachamim". He also brings many cases where chachmei Yisroel ruled to break a light transgression in order to avoid a more severe transgression later. See there (end of § ד) for his examples. He also brings (see § ה) nine examples of poskim who employed the concept of גדולה עבירה לשמה. He ends with the opinion of the Netziv (Meishiv Davar II § 9):

דבעניני הנהגת הציבור לפעמים יש לנהוג עפ"י הכלל דגדולה עבירה לשמה אך ורק בשני תנאים: א. שלא יהיה בזה שום נגיעה והנאה פרטית, וכמו שהקשו חז"ל על יעל "והא קמתהניא מעבירה". ב. שיחשב שכר עבירה כנגד הפסדה והתועלת שתצמח מ"עבירה לשמה" תהיה גדולה מן ההפסד שבה

Regarding guiding a community, sometimes they should be guided according to the principle of גדולה עבירה לשמה. [However], only under the following conditions: 1) There shouldn't be any bias or personal benefit, like Chazal asked about Yael, that she benefited from her transgression. 2) Calculate the benefit of the transgression against its loss. The outcome which will come from this עבירה לשמה should be greater than the loss.

While there are a lot of details here, I see none of the above cases applying to Chizkiya, which is why he was reprimanded by Yeshaya for breaking the Torah.

  • Why do you edit it like that? I didn’t find the material in 167
    – Dr. Shmuel
    Commented Apr 4, 2019 at 13:45
  • @Dr.Shmuel Given that 167 is in parentheses and 165 is in brackets, I imagine it’s because it’s in 167 in older editions but 165 in newer ones.
    – DonielF
    Commented Apr 4, 2019 at 14:34
  • @DrShmuel Rav Asher Weiss quotes it from 167 but I found it in Sefaria on 165. Sometimes Sefaria makes mistakes, or like DonielF says it might depend on the edition, or it's a typo on Rav Asher Weiss' site. To make it easier to find I'd like both there. Thanks for prompting me to edit.
    – robev
    Commented Apr 4, 2019 at 15:07

In the book Orchot Chaim (also called Keter Rosh) R. Asher Ashkenazi collected stories/rulings/teachings from his teacher R. Chaim of Volozhin, many of which in turn came from R. Chaim's teacher R. Elijah of Vilna. One of the entries there (#132) is about the concept of aveira lishma.

In short, he states that the concept does not really exist. Once we have the Torah we have to follow the Torah regardless of any other considerations. If aveira lishma was true then there would be no point of having mitzvot – everyone could just do whatever they wanted provided it was with good intentions.

He says that that is for Jews who have the Torah. But for Noahides, or for Jews before the Torah was given, aveira lishma is a real consideration. For those people it is proper to serve God in whatever way they want (after the seven Noahide commandments), as long as they have good intentions.

Thus, Hezekiah acted incorrectly by not following the commandment to have kids, even though he was well-intentioned, because since the Torah had already been given he was obligated to follow it despite the other considerations.

At the end of the entry he discusses the case of Yael, where the Sages explicitly condoned the aveira lishma. He makes two points:

  1. According to R. Isaac Luria, Yael was a gilgul.
  2. Yael was trying to save all of Israel.

He concludes with a severe warning not to make comparisons to Yael's case.

It thus seems that even though he at first denies that the concept of aveira lishma has any applicability to Jews after the giving of the Torah, there can perhaps be exceptions under very extraordinary circumstances, but we don't really have the right to invoke it.

  • I've heard it invoked in reference to Israeli spies like Eli Cohen, who apparently had a number of mistresses in Syria.
    – Heshy
    Commented Apr 4, 2019 at 13:07

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