Then the Lord said to Moses, “See I have made you like God to Pharaoh, and your brother Aaron will be your prophet.  You are to say everything I command you, and your brother Aaron is to tell Pharaoh to let the Israelites go out of his country.  But I will harden Pharaoh’s heart, and though I multiply my signs and wonders in Egypt, he will not listen to you.  Then I will lay my hand on Egypt and with mighty acts of judgment I will bring out my divisions, my people the Israelites.  And the Egyptians will know that I am the Lord when I stretch out my hand against Egypt and bring the Israelites out of it.  Exodus 7:1-5 (NIV)

“I do not know the Lord and I will not let Israel go.”  Exodus 5:2 (NIV)

"But I know that the king of Egypt will not permit you to go, except under compulsion."  Exodus 3:19 (NIV)

"Moses reported all this to the Israelites, and they did not listen to him because of their discouragement and harsh labor." Exodus 6:9 (NIV)

"GOD’S JUSTICE ENSURES THAT GOD ALWAYS ACTS IN ACCORDANCE WITH WHAT IS RIGHT, AND IS HIMSELF THE STANDARD FOR WHAT IS RIGHT."

 

"SINS PURPOSE IS TO HARDEN OUR HEARTS TOWARDS GOD."

 

"God’s judicial hardening is not presented as the fitful manipulation of an arbitrary ruler (God) cursing morally neutral or even morally pure beings, but as a holy condemnation of a guilty people who are condemned to do and be what they themselves have chosen."  Gospel Coalition