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This is the only parsha in the Torah that begins with this word “vayakhel” which means to gather together. The Midrash comments that Hashem instructed Moshe to assemble the people jointly on Shabbos and lecture them on the laws of Shabbos. It continues that future generations will derive from this practice to also congregate and teach their communities the different laws pertaining to what is permissible and what is prohibited in general but not necessarily related to Shabbos.