Exodus 3:10-13

So now, go. I am sending you to Pharaoh to bring my people the Israelites out of Egypt.” But Moses said to God, “Who am I that I should go to Pharaoh and bring the Israelites out of Egypt?” And God said, “I will be with you. And this will be the sign to you that it is I who have sent you: When you have brought the people out of Egypt, you will worship God on this mountain.” Moses said to God, “Suppose I go to the Israelites and say to them, ‘The God of your fathers has sent me to you,’ and they ask me, ‘What is his name?’ Then what shall I tell them?”