Study Eruvin folio 39B with parallel Hebrew-English text, traditional commentary, and modern study tools. Free access to Babylonian Talmud online.
And the Rabbis hold that there, the 1st day is not observed as a Festival by Torah law but due to rabbinic decree, so that people will not demean the day in future years and end up desecrating the Festival should the witnesses come on time. However, by Torah law it is an ordinary weekday, and there
We learned in the Mishnah that in addition to his ruling with regard to eiruvin for the two days of Rosh HaShana, R' Yehuda said further that the two days can be split with regard to a basket of tevel produce and an egg laid on the 1st day of the Festival.
The Talmud comments: And it was necessary to teach us all 3 laws, as they could not have been derived from one another. As, if he had only taught us the halakha with regard to establishing an eiruv for the two days of Rosh HaShana, one might have said that only in this case does R' Yehuda say his r
And had he taught us only these two halakhot, we might have said that R' Yehuda is lenient because there is no reason to issue a decree prohibiting them, as the potential prohibitions involved are not so severe. But in the case of an egg that was laid on the 1st day of a Festival, where there is re
It was taught in a baraita: How is one to carry out what R' Yehuda said, that a person may make a condition with regard to a basket of tevel produce on the 1st day of the Festival and then eat the produce on the second day? If there were two baskets of tevel produce before him, he says as follows: