Exodus 3:13-14

13And Moses said to 1God, Behold, [when] I come unto the children of Israel, and shall say unto them, The 2God of your fathers hath sent me unto you; and they shall say, What is his name? what shall I say unto them?

14And 3God said to Moses, I AM THAT I AM. And he said, Thus shalt thou say unto the children of Israel: I AM hath sent me unto you.