Eruvin 39: When Rosh Hashanah Falls on Rosh Chodesh
The establishment of Rosh Chodesh, based on witness testimony, and the implications of that for Rosh Hashanah, which, by definition, falls out on Rosh Chodesh, as it were. The Gemara says, set up two eruvin as possible for each day that might be the day of the new moon, vs. the day that retroactively will have been determined to be a regular day. But the sages reject this approach of dividing the holiness of Rosh Hashanah into two. With implications to separating terumot and maaserot as a conditional statement. Likewise, the question of an egg that was laid on the first day. Plus: when the…
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