When talking about the laws of the Mishkan (the desert tabernacle) it says that “Moses gathered all of the Jewish people” and then proceeded to tell them the details of its construction.
Why does the Torah specifically mention Moses gathering the Jews at this point? Wasn’t this done every time he had something new to teach them?
Gathering means bringing disparate parts together. Moses gathering the people teaches us that ‘Unity’ is a necessary precursor for the building of the Mishkan, a building whose entire purpose is to bring G-d’s presence down here below. G-d’s presence can only rest in a wholesome place.
As we recite in the Amidah prayer: “Bless us our father, all of us as One.” In other words, when are we suitable to receive blessing from Above? When we are united.