reprobation

Romans 9

For the Scripture says to Pharaoh, “For this very purpose I have raised you up, that I might show my power in you, and that my name might be proclaimed in all the earth.” 18 So then He has mercy on whomever He wills, and He hardens whomever He wills.

19 You will say to me then, “Why does He still find fault? For who can resist His will?” 20 But who are you, O man, to answer back to God? Will what is molded say to its molder, “Why have you made me like this?” 21 Has the potter no right over the clay, to make out of the same lump one vessel for honorable use and another for dishonorable use? 22 What if God, desiring to show his wrath and to make known his power, has endured with much patience vessels of wrath prepared for destruction,

Remember God did not wait to see what Pharaoh would do with his imaginary "Free-will".

God predestined (prepared in advance) Everything that would take place - before it happened.  And to prove it to us (and Moses) He told us (and Moses) what would happen, before it happened.

Exodus 3 

Come, I will send you to Pharaoh that you may bring my people, the children of Israel, out of Egypt.

But I know that the king of Egypt will not let you go unless compelled by a mighty hand. 20 So I will stretch out my hand and strike Egypt with all the wonders that I will do in it; after that he will let you go. 21 And I will give this people favor in the sight of the Egyptians; and when you go, you shall not go empty, 22 but each woman shall ask of her neighbor, and any woman who lives in her house, for silver and gold jewelry, and for clothing. You shall put them on your sons and on your daughters. So you shall plunder the Egyptians.

Exodus 4 

And the Lord said to Moses, “When you go back to Egypt, see that you do before Pharaoh all the miracles that I have put in your power. But I will harden his heart, so that he will not let the people go. 22 Then you shall say to Pharaoh, ‘Thus says the Lord, Israel is my firstborn son, 23 and I say to you, “Let my son go that he may serve me.” If you refuse to let him go, behold, I will kill your firstborn son.’”

Exodus 6

But the Lord said to Moses, Now you shall see what I will do to Pharaoh; for with a strong hand he will send them out, and with a strong hand he will drive them out of his land. I am the Lord, and I will bring you out from under the burdens of the Egyptians, and I will deliver you from slavery to them, and I will redeem you with an outstretched arm and with great acts of judgment. 7 I will take you to be my people, and I will be your God, and you shall know that I am the Lord your God, who has brought you out from under the burdens of the Egyptians. 8 I will bring you into the land that I swore to give to Abraham, to Isaac, and to Jacob. I will give it to you for a possession. I am the Lord.

Exodus 7

But I will harden Pharaoh's heart, and though I multiply my signs and wonders in the land of Egypt, 4 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. 5 The Egyptians shall know that I am the Lord, when I stretch out my hand against Egypt and bring out the people of Israel from among them.

As the rest of the story plays out Everything that God said would happens does, just as God says it will happen. Realize that a Christian needs not fear random Chance or Luck or another persons imaginary "Free Will" decisions. A Christian needs to remember to Honor God as Sovereign over everything, and make disciples, and preach the Gospel!