Exodus 10:2-6

and that you may tell in the presence of your son, and of your grandson, how I made a mockery of the Egyptians and how I performed My signs among them, so that you may know that I am the Lord.”

So Moses and Aaron went to Pharaoh and said to him, “This is what the Lord, the God of the Hebrews says: ‘How long will you refuse to humble yourself before Me? Let My people go, so that they may serve Me.

For if you refuse to let My people go, behold, tomorrow I will bring locusts into your territory.

And they will cover the surface of the land, so that no one will be able to see the land. They will also eat the rest of what has survived—what is left to you from the hail—and they will eat every tree of yours which grows in the field.

Then your houses will be filled with them, together with the houses of all your servants and the houses of all the Egyptians, something which neither your fathers nor your grandfathers have seen, from the day that they came upon the earth until this day.’ ” And he turned and left Pharaoh.