God calls Moses
Then the lord said: I have seen how cruelly my people are being treated in Egypt; I have heard them cry out to be rescued from their slave drivers. I know all about their suffering, and so I have come down to rescue them from the Egyptians and to bring them out of Egypt to a fertile and spacious land, one which is rich and fertile. Now I am sending you to the king of Egypt so that you can lead my people out of his country.
But moses said to God: I am nobody. How can I go to the king and bring the people out of Egypt?
God answered: I will be with you, and when you bring the people out of Egypt, you will worship me on this mountain. That will the proof that I have sent you.
But moses replied: when I go people and say to them ‘the God of your ancestors sent me to you, they will ask me, what is his name? so what can I tell them?
God said: I am who I am. You must tell them: the ONE who is called I AM has sent me to you; tell them that I, the LORD, the GOD of their ancestors the GOD of Abraham, Isaac, and Jacob, have sent you to them. This is my name forever; this is what all future generations are to call me. Go and gather the leaders of Israel together and tell them that I, the LORD , the GOD of their ancestors, the god of Abraham , Isaac , and Jacob , appeared to you.
from : GOOD NEWS BIBLE