Exodus 7:14-16

14Then the Lord said to Moses, “Pharaoh’s heart is stubborn, and he still refuses to let the people go.

15So go to Pharaoh in the morning as he goes down to the river. Stand on the bank of the Nile and meet him there. Be sure to take along the staff that turned into a snake.

16Then announce to him, ‘The Lord, the God of the Hebrews, has sent me to tell you, “Let my people go, so they can worship me in the wilderness.” Until now, you have refused to listen to him.