In the book of Exodus chapter 3 we read about when God called Moses to lead the children of Israel out from under the oppression of the Pharaoh of Egypt. The following is the English translation of the Hebrew text Exodus 3:13,14 (King James Version Easy-Reading (KJVER) Bible used. Bold are my emphases.)
13 And Moses said to God, Behold, when I come to the children of Israel, and shall say to them, The God of your fathers has sent me to you; and they shall say to me, What is His name? what shall I say to them?
14 And God said to Moses, I AM THAT I AM: and He said, Thus shall you say to the children of Israel, I AM has sent me to you.