In Exodus 3 v 14, Moses is told that God's name is I AM. The original Hebrew word is eyeh. The word expresses the idea of being and not just existing, but an active, dynamic being. It suggests that God is one who makes things happen.
In Exodus 3 v 17 to 21, God then tells Moses what he is about to do. Note the repetition of the phrase I will:
17 I have said, I will bring you up out of the affliction of Egypt to the land of the Canaanite, the Hittite, the Amorite, the Perizzite, the Hivite, and the Jebusite, to a land flowing with milk and honey.” ’ 18 They will listen to your voice. You shall come, you and the elders of Israel, to the king of Egypt, and you shall tell him, ‘The LORD, the God of the Hebrews, has met with us. Now please let us go three days’ journey into the wilderness, that we may sacrifice to the LORD, our God.’ 19 I know that the king of Egypt won’t give you permission to go, no, not by a mighty hand. 20 I will reach out my hand and strike Egypt with all my wonders which I will do amongst them, and after that he will let you go. 21 I will give this people favour in the sight of the Egyptians, and it will happen that when you go, you shall not go empty-handed.