Exodus 3:11-15
But Moses said to God, “Who am I that I should go to Pharaoh and that I should bring the Israelites out from Egypt?” And he said, “Because I am with you, and this will be the sign for you that I myself have sent you: When you bring the people out from Egypt, you will serve God on this mountain.” But Moses said to God, “Look, if I go to the Israelites and I say to them, ‘The God of your ancestors has sent me to you,’ and they say to me, ‘What is his name?’ then what shall I say to them?” And God said to Moses, “Ehyeh Asher Ehyeh [I am what I will become],” and added, “Here is what to say to the people of Israel: Ehyeh [I Will Be] has sent me to you.” And God said again to Moses, “So you must say to the Israelites, “Yahweh, the God of your ancestors, the God of Abraham, the God of Isaac, and the God of Jacob, has sent me to you. This is my name forever, and this is my remembrance from generation to generation.”