And the LORD said to Moses, "Rise early in the morning and stand before Pharaoh as he comes out to the water. Then say to him, "Thus says the LORD: "Let My people go, that they may serve Me.
Exodus 8:20
Surrounding context
8:19 Then the magicians said to Pharaoh, "This is the finger of God." But Pharaoh's heart grew hard, and he did not heed them, just as the LORD had said.
8:20 And the LORD said to Moses, "Rise early in the morning and stand before Pharaoh as he comes out to the water. Then say to him, "Thus says the LORD: "Let My people go, that they may serve Me.
8:21 Or else, if you will not let My people go, behold, I will send swarms of flies on you and your servants, on your people and into your houses. The houses of the Egyptians shall be full of swarms of flies, and also the ground on which they stand.