4 I will allow Pharʹaoh’s heart to become obstinate,+ and he will chase after them, and I will glorify myself by means of Pharʹaoh and all his army;+ and the Egyptians will certainly know that I am Jehovah.”+ So that is what they did.

17 For the scripture says to Pharʹaoh: “For this very reason I have let you remain: to show my power in connection with you and to have my name declared in all the earth.”+ 18 So, then, he has mercy on whomever he wishes, but he lets whomever he wishes become obstinate.+