For the source text click/tap here: Beitzah 17
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We learned that when a Holiday (Yom Tov) falls out on a Friday, one is allowed to cook for the needs of the Yom Tov, but not for the Shabbat right after it. However, if one leaves a little food over from Thursday (called eruvei tavshilin) then cooking for Shabbat becomes permitted.
The Ra’avad explains that the idea of the eruv tavshilin – literally “a combination of foods” – is to prepare a meal for Shabbat at a time when it is permissible, and then food that is made on Yom Tov can be combined with that food in preparation for Shabbat.
We examine the halachot of ET and discuss loopholes in rabbinic Judaism.