Ex 6:2 And God spoke to Moses and said to him: "I am the LORD.

3 "I appeared to Abraham, to Isaac, and to Jacob, as God Almighty, but by My name LORD I was not known to them.

4 "I have also established My covenant with them, to give them the land of Canaan, the land of their pilgrimage, in which they were strangers.

5 "And I have also heard the groaning of the children of Israel whom the Egyptians keep in bondage, and I have remembered My covenant.

6 "Therefore say to the children of Israel: 'I am the LORD; I will bring you out from under the burdens of the Egyptians, I will rescue you from their bondage, and I will redeem you with an outstretched arm and with great judgments.

7 'I will take you as My people, and I will be your God. Then you shall know that I am the LORD your God who brings you out from under the burdens of the Egyptians.

 8 'And I will bring you into the land which I swore to give to Abraham, Isaac, and Jacob; and I will give it to you as a heritage: I am the LORD.'"

The beginning, the middle and the end of these statements is this "I am the LORD." The patriarchs had heard this name, but they had never known it experientially. The name "LORD" is Yahweh, the self-existent One. As the self-existent One He is ever there to keep His promises. Now, Yahweh is going to make good His covenant to Israel. He is going to deliver them. 

Seven times in these verses (6 to 8) God says "I will." God's seven "I wills." Meaning, He is going to completely fulfill what He promised to the patriarchs with regard to their descendants the Israelites.