Exodus 9:27 And Pharaoh sent, and called for Moses and Aaron, and said unto them, I have sinned this time: the Lord is righteous, and I and my people are wicked. 28 Entreat the Lord (for it is enough) that there be no more mighty thunderings and hail; and I will let you go, and ye shall stay no longer.
[Patriarchs & Prophets pp 270] All Egypt trembled before the awful outpouring of divine judgment. Pharaoh hastily sent for the two brothers, and cried out, “I have sinned this time: the Lord is righteous, and I and my people are wicked. Entreat the Lord (for it is enough) that there be no more mighty thunderings and hail; and I will let you go, and ye shall stay no longer.” The answer was, “As soon as I am gone out of the city, I will spread abroad my hands unto the Lord; and the thunder shall cease, neither shall there be any more hail; that thou mayest know how that the earth is the Lord's.
But as for thee and thy servants, I know that ye will not yet fear the Lord God.” Moses knew that the contest was not ended. Pharaoh's confessions and promises were not the effect of any radical change in his mind or heart, but were wrung from him by terror and anguish. Moses promised, however, to grant his request; for he would give him no occasion for further stubbornness. The prophet went forth, unheeding the fury of the tempest, and Pharaoh and all his host were witnesses to the power of Jehovah to preserve His messenger.
Having passed without the city, Moses “spread abroad his hands unto the Lord: and the thunders and hail ceased, and the rain was not poured upon the earth.” But no sooner had the king recovered from his fears than his heart returned to its perversity. Then the Lord said unto Moses, “Go in unto Pharaoh: for I have hardened his heart, and the heart of his servants, that I might show these My signs before him; and that thou mayest tell in the ears of thy son, and of thy son's son, what things I have wrought in Egypt, and My signs which I have done among them; that ye may know how that I am Jehovah.”
Exodus 9:34 And when Pharaoh saw that the rain and the hail and the thunders were ceased, he sinned yet more, and hardened his heart, he and his servants. 35 And the heart of Pharaoh was hardened, neither would he let the children of Israel go; as the Lord had spoken by Moses.
May The Lord add His blessing to the study of His word. God bless!