“When you go to the people of Israel, tell them, ‘I am sent me to you.’ ”
Do you know anyone who goes around saying, “I am”? Neither do I. When we say “I am,” we always add another word. “I am happy.” “I am sad.” “I am strong.” “I am Max.” God, however, starkly states, “I AM” and adds nothing else.
“You are what?” we want to ask. “I AM,” he replies. God needs no descriptive word because he never changes. God is what he is. He is what he has always been. His immutability motivated the psalmist to declare, “But you never change” (Psalm 102:27). The writer is saying, “You are the One who is. You never change.” Yahweh is an unchanging God.
from TRAVELING LIGHT