God said to Moses, “I am who I am . This is what you are to say to the Israelites: ‘I am has sent me to you.’ ” God also said to Moses, “Say to the Israelites, ‘The Lord , 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.
Exodus 3:14-15 NIV
The burning bush experience of Moses was one of a kind. Aside from the unusual sight, God, Himself, revealed His name to Moses. What does God mean when He said that, “I AM WHO I AM”? Afterward, He told Moses to tell the Israelites, “The LORD, the God of your fathers has sent me to you.” Is there a difference between the word “LORD” and “Lord” in the Bible?
The Hebrew word of “Lord,” that’s not in all capital letters, is “adon” which means lord or master. This word can refer to people like a king, the master of the servant, and, sometimes, biblical authors will use this word to refer to God. But the word “LORD” in all capital letters is an indication of the divine name. Its original word is so sacred that the Jewish people don’t want to speak of that name in vain. So they created a visual reminder for the readers to indicate this. That original Hebrew word is YAHWEH. It is the personal name revealed by God to Moses.
When Moses encountered God, he cannot tell the Israelites that “‘I AM’ has sent me” because the people might think that he refers to himself. So God said Moses should say, “YAHWEH, the God of your fathers – the God of Abraham, the God of Isaac and the God of Jacob – has sent me to you. The words “I AM” means “I will be,” and the ancient Hebrew word “YAHWEH” means “He will be.” To say, “I AM” means “I exist.” But as a name, it also suggests timelessness, self-sufficiency, changelessness.