Building the Beis Hamikdash on Shabbos and Yom Tov
The possuk says ve’osu li mishkan ve’shochanti be’sochom – The Rambam explains that this is a mitzva to build the mishkan and also the beis hamikdash . Building the mishkan was not dochech Shabbos –we learn the 39 melachos from the fact that building the mishkan was ossur on Shabbos. The gemara says in Shevuos (15b) that building the beis hamikdash is also not docheh Shabbos and Yom Tov. It is not clear then building the beis hamikdash would always not be docheh Shabbos, however… The mishna in Rosh haShana (30a) says that Rabbon Yochonon ben Zakai instituted that the whole day of the bringing of the omer (the 16th of Missan) chodosh should be ossur. התקין רבן יוחנן בן זכאי ... ושיהא יום הנף כולו אסור The gemara explains that although when there is no beis hamikdash chodosh can be eaten from alos on the 16th, however mehera yibaneh beis hamikdash and people will say that last year we ate chodosh on the 16th so this year we can also. They will not...