In Exodus 3 Moses asked, "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?" God responded by saying, "I am who I am. This is what you are to say to the Israelites: 'I am has sent me to you.'" (vv. 13-14)
"The formula of self-introduction in Exodus 3:14a (along with its explanation in v.14b) means 'I am truly he who exists and who will be dynamically present then and there in the situation to which I am sending you.'