Synopsis of the Books of the Bible, by John Nelson Darby, [1857-62], at sacred-texts.com
Chapter 26. We have a touching picture of the ways of God in patience and in chastisement, if Israel walked contrary to Him. When they acknowledged their fault, then He would remember the covenant made with their fathers, with Abraham, Isaac, and Jacob. This was a covenant made without condition, and with the land. Then He would remember the covenant made with their ancestors, under His name of Jehovah, when they came out of Egypt [See Note #1]. God will take these two titles on their restoration: Almighty, the name of His relationship with the fathers; and Jehovah, the name of His relationship with the people, viewed as taken to Himself at their coming out of Egypt.
I take this to be the covenant of Exodus 6, not the law. It connected itself directly with the covenant made with Abraham, Isaac, and Jacob, adding the name of Jehovah, and taking up the people under that name.