Then the Lord said, “I have seen the affliction of my people who are in Egypt, and have heard their cry because of their taskmasters; I know their sufferings, and I have come down to deliver them out of the hand of the Egyptians, and to bring them up out of that land to a good and broad land, a land flowing with milk and honey, to the place of the Canaanites, the Hittites, the Amorites, the Per′izzites, the Hivites, and the Jeb′usites. And now, behold, the cry of the people of Israel has come to me, and I have seen the oppression with which the Egyptians oppress them. Come, I will send you to Pharaoh that you may bring forth my people, the sons of Israel, out of Egypt.” But Moses said to God, “Who am I that I should go to Pharaoh, and bring the sons of Israel out of Egypt?” He said, “But I will be with you; and this shall be the sign for you, that I have sent you: when you have brought forth the people out of Egypt, you shall serve God upon this mountain.” Then Moses said to God, “If I come to the people of Israel and say to them, ‘The God of your fathers has sent me to you,’ and they ask me, ‘What is his name?’ what shall I say to them?” God said to Moses, “I am who I am.” And he said, “Say this to the people of Israel, ‘I am has sent me to you.’”
-Exodus 3:7-14