Rabbah publicized a Gezerah (command / decree) that Lulav and Shofar should not be used on Shabbat because of a fear someone may violate the Melacha of Hotzaah.
I heard that there was another case that this Gezerah applies to, and I heard it was in the Beit Hamikdash.
Does anyone know what the other Gezerah (potentially) was, and where it is found?