Exodus 3:11-13

11But Moses said to God, "Who am I that I should go to Pharaoh and bring the children of Israel out of Egypt?"

12He said, "But I will be with you, and this shall be the sign for you, that I have sent you: when you have brought the people out of Egypt, you shall serve God on this mountain."

13Then 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?"