Why does the world hold together? Jeremiah gives the unlikely answer: "If not for My covenant day and night, I would not have established the fixed order of heaven and earth" (Jeremiah 33:25). The orbits, the seasons, the rhythm of the cosmos — all of it, the rabbis said, is upheld by the covenant. Remove the Torah from the world and the stars stop on schedule.
This is the theological weight behind the Sabbath. God built the Sabbath into creation before He built anything else worth resting from. The seventh day wasn't added to the week — it was woven into the structure of time itself. The rabbis of Aggadat Bereshit trace this through the prophecies: the covenant of day and night, the covenant with Abraham, the covenant with Israel at Sinai — one continuous thread of divine commitment holding the natural order in place.
In Egypt, Israel had forgotten everything. They were bowing to idols. They had lost the Sabbath. The covenant should have been void — and by ordinary logic it was. But God redeemed them anyway. Not because of their deeds in that moment, which were dismal, but because of the covenant itself. This is the doctrine the rabbis called zekhut avot — the merit of the ancestors. When the present generation has nothing to offer, the covenant made with the patriarchs still stands. The Sabbath still comes. The fixed order still holds. The stars still keep their schedule, not because anyone has earned it, but because God gave His word.