Exodus 10:1-5

1Then the Lord said to Moses, “Go to Pharaoh, for I have hardened his heart and the hearts of his officials so that I may do these miraculous signs of mine among them,

2and so that you may tell your son and grandson how severely I dealt with the Egyptians and performed miraculous signs among them, and you will know that I am the Lord.”

3So Moses and Aaron went in to Pharaoh and told 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, that they may worship me.

4But if you refuse to let my people go, then tomorrow I will bring locusts into your territory.

5They will cover the surface of the land so that no one will be able to see the land. They will eat the remainder left to you that escaped the hail; they will eat every tree you have growing in the fields.