The Sinai Covenant

This afternoon I was reading through Avraham Gileadi's Isaiah commentary and came across a fascinating insight in verse two of chapter one. The verse reads as follows (Gileadi's translation):

Hear, O heavens, and give ear, O earth:
      for the Lord hath spoken,
I have nourished and brought up children,
      and they have rebelled against me.

Gileadi then provides the following commentary:

"Isaiah begins his prophecy by calling on the heavens and the earth, which are witnesses of the Sinai Covenant (Deuteronomy 4:26; 30:19). That is the covenant Jehovah makes with Israel as a nation, through which the descendants of Abraham, Isaac, and Jacob become the people of God (Exodus 6:7). However, the "heavens" and the "earth" don't refer simply to the physical heavens and earth but to those who reside in them. Such heavenly witnesses to the covenant no doubt include Israel's ancestors, Abraham, Isaac, and Jacob, who would have the utmost interest in their descendants.
     
"Additionally, when Jehovah makes the covenant with his people Israel, it includes both those present and those who aren't present (Deuteronomy 29:14–15). That alludes to the idea that there exist others yet unborn who are parties to the covenant as much as the people who stand with Moses at Mount Sinai. In fact, even though God's people Israel may at different times break the Sinai Covenant, that never causes the covenant itself to be annulled. According to Isaiah, even the new covenant Jehovah makes at the dawning of the millennial age is a compound of all former covenants he has made." (underline added)

I don't really have anything additional to add - it made an impression upon me and I wanted to share. Fascinating stuff.