God spoke to Moses and said to him, 'I am Yahweh. To Abraham, Isaac and Jacob I appeared as El Shaddai, but I did not make my name Yahweh known to them. I also made my covenant with them to give them the land of Canaan, the country in which they were living as aliens. Furthermore, I have heard the groaning of the Israelites, enslaved by the Egyptians, and have remembered my covenant. So say to the Israelites, "I am Yahweh. I shall free you from the forced labour of the Egyptians; I shall rescue you from their slavery and I shall redeem you with outstretched arm and mighty acts of judgement. I shall take you as my people and I shall be your God. And you will know that I am Yahweh your God, who have freed you from the forced labour of the Egyptians. Then I shall lead you into the country which I swore I would give to Abraham, Isaac and Jacob, and shall give it to you as your heritage, I, Yahweh." '
[Exodus 6:2-8]