Maybe these will help:
First, read the commentary on the web page. Click to the bottom and read the commentary for the phrases "Elohim blessed the seventh day" and "Then made [the seventh day] holy". The two are related and, I think, speak to your question.
Notwithstanding the commentary above, it's probably not helpful to read Genesis 2:1-4a (the account of the seventh day) as presaging the Sabbath established in Exodus. While the latter surely and deservedly commemorates the seventh day of creation, the seventh day of creation is not a sabbath day (In fact, it's not a day at all because it never ends). In the narrative, the significance of the seventh day of creation is not that God rests or ceases, but that His creative work is complete. Done. Fini.
Here's two articles explaining how the significance of completion is expressed by the author.
Lost in Translation I
Lost in Translation II
As for the Sabbath celebration (the "Exodus Sabbath"), here are two articles that hopefully complement the above:
The Sabbath, Part I
The Sabbath, Part II
Good luck with your search,