Exodus 9:30

“But as for thee, and thy servants, etc.] Notwithstanding the confession of sin he had made, and his earnest request that the Lord might be entreated to remove this plague, and though he had been assured it would be removed: I know that ye will not yet fear the Lord God: they had not feared him yet; the confession of sin made did not arise from the true fear of God, but from a dread of punishment, and when delivered from this plague, the goodness of God would have no such effect as to cause him and his servants to fear the Lord; or “I know, that before ye were afraid of the face of the Lord God” f258, which Kimchi f259 and Ben Melech interpret thus, ''I know that thou and thy servants, before…”

“With the plague of hail begins the last series of plagues, which differ from the former both in their severity and their effects. Each produced a temporary, but real, change in Pharaoh’s feelings. Exodus 9:14 All my plagues - This applies to all the plagues which follow; the effect of each was foreseen and foretold. The words “at this time” point to a rapid and continuous succession of blows. The plagues which precede appear to have been spread over a considerable time; the first message of Moses was delivered after the early harvest of the year before, when the Israelites could gather stubble, i. e. in May and April: the second mission, when the plagues began, was probably toward the end of…”

“Bolled - Grown up into a stalk. Exodus 9:33”

“Pro 16:6; Isa 26:10, Isa 63:17 Exodus 9:31”