Exodus 3:13-15

13Then Moses said to God, ‘If I go to the Israelites, they may not believe me. I will say, “The God that your ancestors worshipped has sent me to you.” But then they will ask me, “What is his name?” Then what will I say to them?’

14God said to Moses, ‘I am who I am! Say this to the Israelite people: “I AM has sent me to you.” ’

15God also said to Moses, ‘Say this to the Israelite people: “It is the Lord God who has sent me to you. He is the God that your ancestors worshipped. He is the God of Abraham, Isaac and Jacob.” That is my name for all time. All generations of my people must call me by that name.