Hot answers tagged eruv-tavshilin
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 ...
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 ...
With regards to the earliest you can make the Eruv on Erev Yom Tov (your actual question), The Nitei Gavriel (Laws of Yom Tov II 81:10) says you can even make it the whole day, even in the morning (meaning not the night before). In the footnotes he explains none of the earlier authorities address this issue, but it appears that it is better to wait till ...
http://hebrewbooks.org/pdfpager.aspx?req=49150&st=&pgnum=38 Lchatchila the Eruv should be made on Erev Yom Tov - anytime starting from the night before (Orach Chaim 527:14). According to the Biur Halacha the food used in the eruv should preferably have been baked or cooked on Erev Yom Tov. ...
It looks like it depends on whether they're eating their parents' food, or are doing their own cooking (using their own supplies or the parents'). In the first case they don't need a separate eiruv, but in the latter case they would. (Shulchan Aruch Harav 527:18, citing Yam Shel Shlomo)
From Shulchan Aruch HaRav 527:14: Generally, everyone makes an Eruv for themselves. The Gadol Sh'Be'ir (great rabbi of the city) is supposed to include the whole city. (This inclusion only works under certain conditions, a person should not rely on it instead of making his own) Later on, the Ba'al HaTanya ruled in his Siddur that everyone who makes an Eruv ...
Here it seems to Indicate if you are Making an Erev For others then you say it http://www.shtaygen.co.il/?CategoryID=1424&ArticleID=5166&Page=1 Seems to agree http://www.ou.org/torah/tt/5759/shavuotnaso59/specialfeatures.htm
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: ...
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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