In different commentaries about the verse of Shemot 3:12, I've read that the entire purpose of leaving Egypt was in order that Bnei Yisrael would come to Har Sinai and accept the Torah (to serve Him on Mount Sinai).
At the berit ben habetarim (the covenant between the pieces) HaShem foretold that Bnei Yisrael would serve in a land not theirs, Bereshit 15:13-14, but would leave it with great possession (Birkus Gadol).
Is it possible that HaShem spoke of His Torah when he spoke of this possession (other than the gold and silver, Shemot 3:21-22)?
The first commandment of the Aseret Devarim reads (Shemot 20:2): I am HaShem, who have brought thee out of the land of Mizraim, out of the house of servitude. IBN Ezra explains that Bnei Yisrael was bought by Him (15:16) in order to serve HaShem (Vayikra 25:55).
If the entire purpose of leaving Egypt was in order that Bnei Yisrael would come to Har Sinai and accept the Torah and serve Him, than what of that was foretold to Avraham Avinu?
I'm trying to see the connection between the prophecy (?) that was given to Avraham and the actual story of Yisrael leaving Egypt.