Go to Pharaoh in the morning, when he goes out to the water, and you shall stand by the river's bank to meet him; and the rod which was turned to a serpent you shall take in your hand.
Exodus 7:15
Surrounding context
7:14 So the LORD said to Moses: "Pharaoh's heart is hard; he refuses to let the people go.
7:15 Go to Pharaoh in the morning, when he goes out to the water, and you shall stand by the river's bank to meet him; and the rod which was turned to a serpent you shall take in your hand.
7:16 And you shall say to him, "The LORD God of the Hebrews has sent me to you, saying, "Let My people go, that they may serve Me in the wilderness"; but indeed, until now you would not hear!