16 And in the first day there shall be an holy convocation, and in the seventh day there shall be an holy convocation to you; no manner of work shall be done in them, save that which every man must eat, that only may be done of you.

Not only did God specify the duration of the feast and the diet for it, He also mandated that “no manner of work shall be done in them.” This was to be a rest and respite from the daily toils, and the only labor that God allowed for was the necessary work to have food for that day. There are a number of reasons and symbols that can be seen in this instruction.

1. This would help to keep a remembrance of Israel being liberated from their slavery in Egypt. Their daily toil had been the hard labor of making bricks for Egypt’s construction projects, and they were beholden to their taskmasters for any rest and respite. Now, though, God would free them, and every year they would be reminded that they now had the pleasure of being able to take an entire week off with none to tell them otherwise.
2. Setting aside one’s work also calls to mind when God rested the seventh day, after creating the Earth. This feast was initiated as the Israelite people were being led into a new chapter, and it was to be observed forever after at the beginning of each new year. This calls to mind themes of new creation, fresh starts, the end of one phase and the beginning of a new and better one.
3. Finally, the Israelites were specifically being instructed to set aside their worldly work. They weren’t to spin, or craft, or sell. They weren’t to try and gain worldly wealth, or collect on worldly debts. They were to be focused on only doing the work they had been given by the divine. They would sacrifice their lambs, make the Passover meal, share with their neighbors, and burn the excess before the new day. A much lesser load than the usual workday, and a sign that they would sanctify their efforts to the Lord and He, in turn, would provide for them.