Exodus 8:15

“But Pharaoh will not listen to you. And I will set My hand upon Egypt and bring out My hosts, My people the sons of Israel, from the land of Egypt by great judgments.

Yet Pharaoh’s heart was hardened with strength, and he did not listen to them, as Yahweh had spoken.

Then Pharaoh called for Moses and Aaron and said, “Entreat Yahweh that He may cause the frogs to depart from me and from my people; and I will let the people go, that they may sacrifice to Yahweh.”

And Pharaoh said, “I will let you go, that you may sacrifice to Yahweh your God in the wilderness; only you shall not go very far away. Entreat for me.”

Then Moses said, “Behold, I am going out from you, and I shall entreat Yahweh that the swarms of flies may depart from Pharaoh, from his servants, and from his people tomorrow; only may Pharaoh not deal deceitfully again in not letting the people go to sacrifice to Yahweh.”

Then Pharaoh hardened his heart with firmness this time also, and he did not let the people go.

“Why then do you harden your hearts as the Egyptians and Pharaoh hardened their hearts? When He had abused them, did they not allow the people to go, and they went?

“Then You performed signs and wonders against Pharaoh, Against all his servants and all the people of his land; For You knew that they acted presumptuously toward them, And made a name for Yourself as it is this day.

Like a dog that returns to its vomit Is a fool who repeats his folly.