What is the source for the idea that doing some good thing 3 times constitutes a vow? I looked through Hilkhot Sevuot and Nedarim, and in the Entziklopedia Talmudit under Hazaka, and I could find no such idea.


3 Answers 3


If a person decides to intentionally do something which is a "chumrah" (voluntary strict practice, not required by law) and also intends that his practice be his new way of acting forever, (AND he is well aware that it is not obligatory,) then it has the halachic force of a neder (vow) even if he only does it one time. (see Shulchan Aruch Yoreh Deah 214:1; based on Talmud tractate Nedarim 15a.) The novelty here is that the vow takes effect without a verbal declaration. (D'Rabbanan)

If a person had in mind that the good practice would be a one time affair (or for the next 4 times for example, but no further) then that is OK. (This means that a person can limit the vow by such parameters.) If he had in mind that the practice would specifically not be binding, then it is not a vow at all. If a person accidentally thought that what he was doing is obligatory, then we pasken like the authorities there (214:1) that there is no vow.

The Gemara and Shulchan Aruch in the source does not mention 3 times.

Rav Shlomo Ganzfried (1804 - 1886) writes in Kitzur Shulchan Aruch 67:7, that in addition, if the person did not intend to have his new practice be from now on and forever, but had nothing particular in mind, then we apply the rule that if he did it 3 times (without having in mind that it is not a vow,) then it becomes a vow.

Other Rabbis and prayerbook authorities (commenting on hataras nedarim in the machzor) apply this rule like the Kitzur SA does. It is based on the principle of a "Chazakah" being created by anything done 3 times. (See Talmud Baba Basra - beginning of 3d chapter, for the general halachic concept of 3 times being a chazakah.)

Finally, it should be noted that there are therefore halachic leniencies regarding such a vow, such as special instances when the vow might not be in force, and how to retract such a vow in front of a Rav. As always, one should consult their LOR.

  • Thank you! I would just clarify that the ShA 214 specifies that this is about prohibiting oneself some thing (a neder), not undertaking to do something (which could be a sh'vua), and I meant to ask about the latter. Commented Sep 22, 2015 at 15:40

I'm not sure about an original source, but it's mentioned in Hatarat Nedarim done on Erev Rosh Hashanah:

או אֵיזו הַנְהָגָה טובָה או אֵיזֶה דָבָר טוב שֶׁנָּהַגְתִּי שָׁלשׁ פְּעָמִים וְלא הִתְנֵיתִי שֶׁיְּהֵא בְּלִי נֶדֶר (text source)

... Or any good act or good thing that i have done three times and did not stipulate that it should not be a neder ... (my own translation)

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    This is not a great answer. It doesn't mention the origin of the notion. The siddur version of Hatarat Nedarim, was formulated far later than the concept of the 3 time practice being a form of vow. I.e., the text formulation just states that it requires absolution, but obviously, it is extracting that notion from somewhere else, possibly from the Gemarah. This would be more appropriate as a comment.
    – DanF
    Commented Sep 21, 2015 at 21:09
  • The Imrei Yosher 2:136 uses the Hataras Nedarim Erev Rosh Hashana as a primary source, so the answer doesn't deserve the negative attitude, IMO.
    – Yishai
    Commented Sep 21, 2015 at 22:46
  • It may be worth noting that the link (marked as "text source") says: "וכנראה שלא ידעו הקדמונים והפוסקים הראשונים על מנהג התרת הנדרים בערב ראש השנה או בעשרת ימי תשובה, חוץ מנוסח כל נדרי שאמרו בליל יום כיפור לפני תפילת מעריב. הראשון שמביא את מנהג התרת נדרים הוא בעל השל"ה...".
    – Tamir Evan
    Commented Jan 10 at 19:54
  • (In my translation: "Apparently, the ancient[ sage]s and Rishonic decisors didn't know of the custom of Hatarat Nedarim [done] on Erev Rosh Hashanah, or during Aseret Yemei Teshuvah, but [knew] only of Kol Nidrei, said on the night of Yom Kippur, before Ma'ariv. The first to bring the custom of Hatarat Nedarim was author of the Shelah...".)
    – Tamir Evan
    Commented Jan 10 at 19:54

I will provide sources later. But it's really a recent innovation. It's not Mishnaic, Talmudic, nor Geonic. Rabbi Dovid Fink gave an excellent course that mentioned this exact topic and if I can find the link later I'll post it.

Update: I was hoping to go back and listen to the class to get the exact quote but I don't have time. I will summarize as follows: There is no source for doing 3 times = a vow until very recent times. No one in Biblical, Rabbinic, or Geonic times would have practiced such a concept. The full breakdown can be found in this free class by halakhist Dovid Fink


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    Did you end up finding R. Fink's treatment? Commented May 14 at 16:37
  • @Deuteronomy thanks for commenting. I've added the class which I believe discusses this topic. If you come across the source more directly when you watch this free class please share it with me and I'll update my answer
    – Aaron
    Commented May 14 at 17:19
  • Thanks, do you happen to know which of the 8 classes the content can be found in? Commented May 14 at 17:25
  • I do not. But I have never regretted watching a class by Dovid Fink. He brings you all the sources, tells you where to find them, translates them into english and just overall has a real mastery of the topics paired with intellectual honesty, a combination that shouldn't be as rare as it is
    – Aaron
    Commented May 14 at 17:40

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