He sinned yet more, and hardened his heart - These were merely acts of his own; "for who can deny," says Mr. Psalmanazar, "that what God did on Pharaoh was much more proper to soften than to harden his heart; especially when it is observable that it was not till after seeing each miracle, and after the ceasing of each plague, that his heart is said to have been hardened? The verbs here used are in the conjugations pihel and hiphil, and often signify a bare permission, from which it is plain that the words should have been read, God suffered the heart of Pharaoh to be hardened." - Universal Hist., vol. i., p. 494. Note D.

And when Pharaoh saw that the rain, and the hail, and the thunders were ceased,.... And there was a clear sky and a fine serene heaven, the black clouds were dispersed and gone, and he heard no more the clattering of the hailstones, and the terrible claps of thunder, and saw no more the flashes of lightning, but all was calm and composed:

he sinned yet more, and hardened his heart, he and his servants; instead of giving glory to God, who had heard the prayers of Moses and Aaron for them, and had delivered them from their frights and fears, and the terror and horror they were in, and of letting the people of Israel go, see Revelation 16:21.

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.

9:22-35 Woful havoc this hail made: it killed both men and cattle; the corn above ground was destroyed, and that only preserved which as yet was not come up. The land of Goshen was preserved. God causes rain or hail on one city and not on another, either in mercy or in judgment. Pharaoh humbled himself to Moses. No man could have spoken better: he owns himself wrong; he owns that the Lord is righteous; and God must be justified when he speaks, though he speaks in thunder and lightning. Yet his heart was hardened all this while. Moses pleads with God: though he had reason to think Pharaoh would repent of his repentance, and he told him so, yet he promises to be his friend. Moses went out of the city, notwithstanding the hail and lightning which kept Pharaoh and his servants within doors. Peace with God makes men thunder-proof. Pharaoh was frightened by the tremendous judgment; but when that was over, his fair promises were forgotten. Those that are not bettered by judgments and mercies, commonly become worse.