Exodus 3:14-15

14God said to Moses, “I am who I am.”
Or  I am what I am, or  I will be what I will be
And he said, “Say this to the people of Israel: bI am has sent me to you.’”
15God also said to Moses, “Say this to the people of Israel: ‘The Lord,
The word Lord, when spelled with capital letters, stands for the divine name, YHWH, which is here connected with the verb hayah, “to be” in verse 14
the dGod of your fathers, the God of Abraham, the God of Isaac, and the God of Jacob, has sent me to you.’ This is emy name forever, and thus I am to be remembered throughout all generations.
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