Exodus 3:18-20

“The elders of Israel will accept your message. Then you and the elders must go to the king of Egypt and tell him, ‘The LORD, the God of the Hebrews, has met with us. So please let us take a three-day journey into the wilderness to offer sacrifices to the LORD, our God.’ “But I know that the king of Egypt will not let you go unless a mighty hand forces him. So I will raise my hand and strike the Egyptians, performing all kinds of miracles among them. Then at last he will let you go.