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It's great that you make a Brocho, and say the declaration. But how does it allow you to cook for Shabbos on Yom Tov? What is it about it that makes it Muttar?

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up vote 9 down vote accepted

On a Biblical level you'd be allowed to cook on a Yom Tov even for a weekday, so long as there is enough time left in the day that you'd actually be able to eat the dishes you're preparing, if you're so inclined.

The Eruv Tavshilin, then, is needed only because of the Rabbinical enactment forbidding preparations on Yom Tov for afterwards. It represents the beginning of your preparations for Shabbos; then, the rest of the cooking (or whatever other activity you do) is a continuation of that. This serves two purposes:

  • It reminds people that Yom Tov is special, and that one may not cook on it for other days.

  • It also reminds you that Shabbos is coming, so that you don't end up using all the good food for Yom Tov and forget about Shabbos altogether.

(Beitzah 15a and Rashi there; Shulchan Aruch Harav 527:1)

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Yasher koach! Beat me by 24 seconds! (And a more complete answer too. But baruch shekivanti that it was basically.) – Shalom Sep 12 '10 at 2:52
(Your point about having time left in the day is debatable- that's according to those that hold the Biblical permit is based on "ho'il") – YDK Sep 12 '10 at 3:02
YDK: what's the other opinion? I was under the impression that everyone agrees to that principle. – Alex Sep 12 '10 at 17:25

It's debated in the Gemara, but the simple answer as I recall it is basically, it's allowed to prepare from yomtov to Shabbos. But Chazal want to remind people that this is the special case for Shabbos, not that you can always prepare on yomtov for the next day. Making an Eiruv is the way we remind people of this.

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