Exodus 7:13

²¹The LORD said to Moses, “When you go back into Egypt, see that you do before Pharaoh all the wonders which I have put in your hand, but I will harden his heart and he will not let the people go.

¹⁵But when Pharaoh saw that there was a respite, he hardened his heart, and didn’t listen to them, as the LORD had spoken.

¹¹But they refused to listen, and turned their backs, and stopped their ears, that they might not hear. ¹²Yes, they made their hearts as hard as flint, lest they might hear the law and the words which the LORD of Armies had sent by his Spirit by the former prophets. Therefore great wrath came from the LORD of Armies.

²⁰But the LORD hardened Pharaoh’s heart, and he didn’t let the children of Israel go.

⁷Therefore, even as the Holy Spirit says, “Today if you will hear his voice, ⁸don’t harden your hearts as in the rebellion, in the day of the trial in the wilderness,

²⁷But the LORD hardened Pharaoh’s heart, and he wouldn’t let them go.

¹The 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 my signs among them;

²⁸Even as they refused to have God in their knowledge, God gave them up to a reprobate mind, to do those things which are not fitting;

⁵But according to your hardness and unrepentant heart you are treasuring up for yourself wrath in the day of wrath, revelation, and of the righteous judgment of God,

¹³but exhort one another day by day, so long as it is called “today”, lest any one of you be hardened by the deceitfulness of sin.