Exodus 8:20 in the King James Version
And the LORD said unto Moses, Rise up early in the morning, and stand before Pharaoh; lo, he cometh forth to the water; and say unto him, Thus saith the LORD, Let my people go, that they may serve me.
Context
19 Then the magicians said to Pharaoh, “This is God’s finger;” but Pharaoh’s heart was hardened, and he didn’t listen to them, as the LORD had spoken.
20 The LORD said to Moses, “Rise up early in the morning, and stand before Pharaoh; behold, he comes out to the water; and tell him, ‘This is what the LORD says, “Let my people go, that they may serve me.
21 Else, if you will not let my people go, behold, I will send swarms of flies on you, and on your servants, and on your people, and into your houses. The houses of the Egyptians shall be full of swarms of flies, and also the ground they are on.