And Jehovah said to Moses, Go in to Pharaoh, for I have hardened his heart and the heart of his servants, so that I might show these My signs before him,

And they made their hearts adamant from hearing the Law and the Words which Jehovah of Hosts has sent through His Spirit, by the former prophets. And great wrath came from Jehovah of Hosts.

He refuseth

And I say to you, Let My son go, that he may serve Me. And if you refuse to let him go, behold, I am going to kill your son, your first-born.

And if you refuse to let them go, behold, I am going to strike all your borders with frogs.

For if you refuse to let them go, and will hold them still,

For if you refuse to let My people go, behold, tomorrow I will bring the locusts into your coast.

but if you refuse and rebel, you shall be devoured with the sword; for the mouth of Jehovah has spoken.

Why has this people of Jerusalem slidden back by a never-ending backsliding? They hold fast to deceit; they refuse to return.

Your dwelling is in the midst of deceit; through deceit they refuse to know Me, says Jehovah.

See that you do not refuse Him who speaks. For if they did not escape, those who refused him that spoke on earth, much more we shall not escape if we turn away from Him who speaks from Heaven,

General references

And Pharaoh hardened his heart at this time also, neither would he let the people go.

And Jehovah hardened the heart of Pharaoh, and he did not listen to them, even as Jehovah had spoken to Moses.

But Jehovah hardened Pharaoh's heart, and he did not let the sons of Israel go.