Exodus 3:19; Exodus 7:4; Exodus 10:1

19 But I know that the king of Egypt awill not let you go unless compelled bby a mighty hand.1

Pharaoh will not listen to you. Then I will lay my hand on Egypt and bring my hosts, my people the children of Israel, out of the land of Egypt by great acts of judgment.

The Eighth Plague: Locusts

10 Then the Lord said to Moses, Go in to Pharaoh, for I have hardened his heart and the heart of his servants, that I may show these signs of mine among them,