In the beginning of ?????? ???? ????? it says ????? ???? ??? ??? that Hashem retrospectively brought forward the gift of ???. The ?????? explain this to mean that Moshe arranged with Paraoh to davka be given shabbos off, even before ???, in spite of the fact that a lot of ????? had yet to be given.
I wasn’t disagreeing with that point. But simply taking a day off from work is not keeping Shabbos. Keeping Shabbos means refraining from the 39 melachos. There is no reason to say that that’s what they did in Egypt before the Halachos of Shabbos were given. So yes, they may have taken the day off from work, but they might have still written things, engaged in borer, carried in and out of their homes and so on. They may have had the day of Shabbos off from their toils, but I don’t think you can say that “kept Shabbos.”
The Wolf
The Wolf