Exodus 7:14-16

14Then the Lord said to Moses, “Pharaoh’s heart is hard: He refuses to let the people go.

15Go to Pharaoh in the morning. When you see him walking out to the water, stand ready to meet him by the bank of the Nile. Take in your hand the staff that turned into a snake.

16Tell him: The Lord, the God of the Hebrews, has sent me to tell you: Let my people go, so that they may worship me in the wilderness. But so far you have not listened.