Exodus 6:1-5

And Jehovah said unto Moses, Now shalt thou see what I will do to Pharaoh: for by a strong hand shall he let them go, and by a strong hand shall he drive them out of his land. And God spake unto Moses, and said unto him, I am Jehovah: and I appeared unto Abraham, unto Isaac, and unto Jacob, as God Almighty; but by my name Jehovah I was not known to them. And I have also established my covenant with them, to give them the land of Canaan, the land of their sojournings, wherein they sojourned. And moreover I have heard the groaning of the children of Israel, whom the Egyptians keep in bondage; and I have remembered my covenant.