I've found different sources like the Mishnah, Babylonian Talmud (tractate Rosh HaShanah), Jerusalem Talmud, Tosefta etc., talking about the Minim and the Boethusians who wanted to fix the festival of Shavuot the day after the Shabbat, i.e. on Sunday.

I would really like to know what are the earliest sources known about this topic, and what's the whole story behind this.

Please, feel free to edit.

  • To clarify: They wanted the first day of sefirah to be on Sunday, because they took the Torah literally when it said ממחרת השבת, they didn't care when Shavuos was
    – user613
    Commented May 12, 2016 at 22:42
  • @user613 thank you: Rabbi Nehorai bar Shinai, a tanna of the fourth generation, states: It happened that I went down to give evidence of a certain witness in Ushah, and they did not need me, but I sought a pretext to visit my fellows. And what was the evil there? That they used to say Atzeret followed the Shabbat and they used to go out on it while it was still evening, taking it for granted that it would be sanctified… A quote related to the evil doings of the Minim and Boethusians, that shows that the date of Shavuot did matter, main issue tough was the change of the start of sefirah.
    – Levi
    Commented May 13, 2016 at 10:49
  • @user613 I'm sure the minim/Sadducees thought that we were the ones who didn't care when Shavuot actually was and they accused us od changing the date
    – Aaron
    Commented May 13, 2016 at 15:18
  • The Boethusians who were talking about the minim also wanted to Shavuos to be Sunday?
    – msh210
    Commented May 13, 2016 at 17:59
  • Are you familiar with the ATBASH for the calendar? Could it be the cause, as they thought, of the calendar corruption? Like modern day "Watch Tower" sect/minim think it is, so they are calculating their own so called "14th of nissan". Take a look at this article en.wikibooks.org/wiki/Mathematics_of_the_Jewish_Calendar/… A gittn shabes. Commented May 13, 2016 at 20:14


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