So Moses and Aaron came in to Pharaoh and said to him, "Thus says the LORD God of the Hebrews: "How long will you refuse to humble yourself before Me? Let My people go, that they may serve Me.
Exodus 10:3
Surrounding context
10:2 and that you may tell in the hearing of your son and your son's son the mighty things I have done in Egypt, and My signs which I have done among them, that you may know that I am the LORD."
10:3 So Moses and Aaron came in to Pharaoh and said to him, "Thus says the LORD God of the Hebrews: "How long will you refuse to humble yourself before Me? Let My people go, that they may serve Me.
10:4 Or else, if you refuse to let My people go, behold, tomorrow I will bring locusts into your territory.