Our Parsha Vayakhel is dedicated to teaching B’nai Yisrael about Shabbos which has always, until recent times, been the unifying, defining factor of Judaism. It alludes to all else — Yishuv HaAretz, Kiddushin, etc. It symbolizes the Jew’s faith in Hashem. And the melachot involved in the construction of the Mishkan were meant to define the paradigms of melachot prohibited on Shabbos.
The parsha begins by stating that “Moshe assembled the entire congregation of B’nai Yisrael…” (Perek 35, Posuk 1) Torah’s loshen (language) “Adat B’nai Yisrael”, in the context of learning the laws of Shabbos as related to the construction of the Mishkan, seems to indicate a unity — the Assembly of the B’nai Yisrael.as if one single entity.