Exodus 6:3-7

and I appeared to Abraham, Isaac, and Jacob as God Almighty, but by My name, Lord, I did not make Myself known to them.

I also established My covenant with them, to give them the land of Canaan, the land in which they lived as strangers.

Furthermore I have heard the groaning of the sons of Israel, because the Egyptians are holding them in bondage, and I have remembered My covenant.

Say, therefore, to the sons of Israel, ‘I am the Lord, and I will bring you out from under the labors of the Egyptians, and I will rescue you from their bondage. I will also redeem you with an outstretched arm, and with great judgments.

Then I will take you as My people, and I will be your God; and you shall know that I am the Lord your God, who brought you out from under the labors of the Egyptians.