Go to Pharaoh in the morning as you see him walking out to the water. Wait on the bank of the Nile to meet him, and take in your hand the staff that was changed into a snake.

Exodus 2:5
Soon the daughter of Pharaoh went down to bathe in the Nile, and her attendants were walking along the riverbank. And when she saw the basket among the reeds, she sent her maidservant to retrieve it.

Exodus 4:2
And the LORD asked him, "What is that in your hand?" "A staff," he replied.

Exodus 4:3
"Throw it on the ground," said the LORD. So Moses threw it on the ground, and it became a snake, and he ran from it.

Exodus 7:10
So Moses and Aaron went to Pharaoh and did just as the LORD had commanded. Aaron threw his staff down before Pharaoh and his officials, and it became a serpent.

Exodus 7:14
Then the LORD said to Moses, "Pharaoh's heart is unyielding; he refuses to let the people go.

Exodus 8:20
Then the LORD said to Moses, "Get up early in the morning, and when Pharaoh goes out to the water, stand before him and tell him that this is what the LORD says: 'Let My people go, so that they may worship Me.

1 Chronicles 16:21
He let no man oppress them; He rebuked kings on their behalf:

Get you to Pharaoh in the morning; see, he goes out to the water; and you shall stand by the river's brink against he come; and the rod which was turned to a serpent shall you take in your hand.