Then 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,
References for Exodus 10:1
and 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."
References for Exodus 10:2
So 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.
But if you refuse to let My people go, then tomorrow I will bring locusts into your territory.
They 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.
They will fill your houses, all your officials' houses, and the houses of all the Egyptians-something your fathers and ancestors never saw since the time they occupied the land until today." Then he turned and left Pharaoh's presence.
Pharaoh's officials asked him, "How long must this man be a snare to us? Let the men go, so that they may worship the Lord their God. Don't you realize yet that Egypt is devastated?"
So Moses and Aaron were brought back to Pharaoh. "Go, worship the Lord your God," Pharaoh said. "But exactly who will be going?"
Moses replied, "We will go with our young and our old; we will go with our sons and daughters and with our flocks and herds because we must hold the Lord's festival."
He said to them, "May the Lord be with you if I [ever] let you and your families go! Look out-you are planning evil.
References for Exodus 10:10
No, only the men may go and worship the Lord, for that is what you have been asking for." And they were driven from Pharaoh's presence.
The Lord then said to Moses, "Stretch out your hand over the land of Egypt and the locusts will come up over it and eat every plant in the land, everything that the hail left."
So Moses stretched out his staff over the land of Egypt, and the Lord sent an east wind over the land all that day and through the night. By morning the east wind had brought in the locusts.
The locusts went up over the entire land of Egypt and settled on the whole territory of Egypt. Never before had there been such a large number of locusts, and there will never be again.
They covered the surface of the whole land so that the land was black, and they consumed all the plants on the ground and all the fruit on the trees that the hail had left. Nothing green was left on the trees or the plants in the field throughout the land of Egypt.
Pharaoh urgently sent for Moses and Aaron and said, "I have sinned against the Lord your God and against you.
Please forgive my sin once more and make an appeal to the Lord your God, so that He will take this death away from me."
Moses left Pharaoh's presence and appealed to the Lord.
Then the Lord changed the wind to a strong west wind, and it carried off the locusts and blew them into the Red Sea. Not a single locust was left in all the territory of Egypt.
References for Exodus 10:19
But the Lord hardened Pharaoh's heart, and he did not let the Israelites go.