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I recall hearing that if you forgot to make an Eruv Tavshilin there is a way to make it on the first day of Yom Tov. Does anyone know how this is done?

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up vote 8 down vote accepted

Shulchan Aruch (Orach Chaim 527:22) says that you should make the following declaration when making an Eruv on the first day of Yom Tov:

"If today is a Yom Tov, then I don't need an Eruv [because tomorrow is really a weekday, and I can prepare for Shabbos as usual]. But if today is a weekday, then with this Eruv I shall be allowed to bake, cook, ...."

Note the following caveats:

  • This doesn't work for Rosh Hashanah, because its two days are halachically considered "one long day."

  • According to one opinion cited in Shulchan Aruch there, this works only if you have some food already prepared from before Yom Tov. (Though Mishnah Berurah, ibid. :75, says that in practice we don't follow this opinion.)

  • There are variant opinions as to whether to recite the blessing when making an Eruv with this condition (Mishnah Berurah ibid. :74).

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Hirhurim just put up a post discussing both the first day solution and the rely-on-the-Rabbi solution.

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Can you include a short summary? – Double AA Aug 22 '13 at 21:28

This doesn't directly answer the question posed, but something to bear in mind is that one who lives in a community where the rabbi makes an eruv tavshilin including "ולכל בני ישראל הדרים בעיר הזאת" can rely on said rabbi's eruv if he forgot to make one himself — but not twice in a row (viz, not two occasions in a row for which he should have made an eruv: these will often not be consecutive holidays). (No source handy, sorry.)

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I don't know if this is true, but I heard that you can only use the Rabbi's Eruv once. I don't have any sources. – d a Oct 4 '10 at 23:20
@da msh210 See Beitza 16b. – Double AA Feb 1 '13 at 15:32

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