Exodus 3:16-20 New International Version (NIV)
16 “Go, assemble the elders of Israel and say to them, ‘The Lord, the God of your fathers—the God of Abraham, Isaac and Jacob—appeared to me and said: I have watched over you and have seen what has been done to you in Egypt. 17 And I have promised to bring you up out of your misery in Egypt into the land of the Canaanites, Hittites, Amorites, Perizzites, Hivites and Jebusites—a land flowing with milk and honey.’
18 “The elders of Israel will listen to you. Then you and the elders are to go to the king of Egypt and say to him, ‘The Lord, the God of the Hebrews, has met with us. Let us take a three-day journey into the wilderness to offer sacrifices to the Lord our God.’ 19 But I know that the king of Egypt will not let you go unless a mighty hand compels him. 20 So I will stretch out my hand and strike the Egyptians with all the wonders that I will perform among them. After that, he will let you go.
God told Moses to tell the people what he saw and heard at the burning bush. He told them that God is the God who acts and speaks. If you are trying to tell others about God, talk about what he has done for you. God knows who will accept him and who will not. God knows the future. Believers can trust their futures to God because he already knows what is going to happen.