Exodus 3:13-15 New International Version (NIV)
13 Moses said to God, “Suppose I go to the Israelites and say to them, ‘The God of your fathers has sent me to you,’ and they ask me, ‘What is his name?’ Then what shall I tell them?”
14 God said to Moses, “I am who I am.[a] This is what you are to say to the Israelites: ‘I am has sent me to you.’”
15 God also said to Moses, “Say to the Israelites, ‘The Lord,[b] the God of your fathers—the God of Abraham, the God of Isaac and the God of Jacob—has sent me to you.’
“This is my name forever,
the name you shall call me
from generation to generation.