1)
Is Shabbos not already included in "v'Daber Imahem" (Aseres ha'Dibros)?
1.
Rashi: It is mentioned separately, for it is honored in rest and added intellect.
2.
Malbim: Via Shabbos, Hashem informed them of foundations of Emunah - Chidush ha'Olam, and that Hashem conducts them with Hashgachah.
2)
Which Mitzvos, Chukim and Torah are discussed here?
1.
Malbim: All that He gave to them while at Midbar Sinai, until they came to Midbar Paran - the Mitzvos in Shemos, Vayikra and Bamidbar, until Shlach.
