What does Exodus 3:15 mean?

God also said, 'Say this to the Israelites: "The LORD, the God of your ancestors—the God of Abraham, Isaac, and Jacob—sent me to you." This is my name forever; people will remember me by this for all generations.' Exodus 3:15 - Modern Text Bible

(God connects His identity to the promises made to the patriarchs, grounding Moses' message in their shared history.)