Exodus 7:14-16

14The Lord said to Moses, “Pharaoh’s heart is hard; he refuses to release the people.

15Go to Pharaoh in the morning when he goes out to the water. Position yourself to meet him by the edge of the Nile, and take in your hand the staff that was turned into a snake.

16Tell him, ‘The Lord, the God of the Hebrews, has sent me to you to say, “Release my people, that they may serve me in the desert!” But until now you have not listened.