Exodus 3:12

9 For now, truly, the cry of the children of Israel has come to me, and I have seen the cruel behaviour of the Egyptians to them.

10 Come, then, and I will send you to Pharaoh, so that you may take my people, the children of Israel, out of Egypt.

11 And Moses said to God, Who am I to go to Pharaoh and take the children of Israel out of Egypt?

12 And he said, Truly I will be with you; and this will be the sign to you that I have sent you: when you have taken the children of Israel out of Egypt, you will give worship to God on this mountain.

13 And Moses said to God, When I come to the children of Israel and say to them, The God of your fathers has sent me to you: and they say to me, What is his name? what am I to say to them?

14 And God said to him, I AM WHAT I AM: and he said, Say to the children of Israel, I AM has sent me to you.

15 And God went on to say to Moses, Say to the children of Israel, The Lord, the God of your fathers, the God of Abraham, of Isaac, and of Jacob, has sent me to you: this is my name for ever, and this is my sign to all generations.