Matthew Henry on Exodus 9:13-21
Here is, I. A general declaration of the wrath of God against Pharaoh for his obstinacy. Though God has hardened his heart (Exo 9:12), yet Moses must repeat his applications to him; God suspends his grace and yet demands obedience, to punish him for requiring bricks of the children of Israel when he denied them straw. God would likewise show forth a pattern of long-suffering, and how he waits to be gracious to a rebellious and gainsaying people Six times the demand had been made in vain, yet Moses must make it the seventh time: Let my people go, Exo 9:13. A most dreadful message Moses is here ordered to deliver to him, whether he will hear or whether he will forbear. 1. He must tell him that…
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Moses took ashes from the furnace--Hebrew, "brick-kiln." The magicians, being sufferers in their own persons, could do nothing, though they had been called; and as the brick-kiln was one of the principal instruments of oppression to the Israelites [Deu 4:20; Kg1 8:51; Jer 11:4], it was now converted into a means of chastisement to the Egyptians, who were made to read their sin in their punishment.
Adam Clarke on Exodus 9:11
The boil was upon the magicians - They could not produce a similar malady by throwing ashes in the air; and they could neither remove the plague from the people, nor from their own tormented flesh. Whether they perished in this plague we know not, but they are no more mentioned. If they were not destroyed by this awful judgment, they at least left the field, and no longer contended with these messengers of God. The triumph of God's power was now complete, and both the Hebrews and the Egyptians must see that there was neither might, nor wisdom, nor counsel against the Lord; and that, as universal nature acknowledged his power, devils and men must fail before him.
John Gill on Exodus 9:14
For I will at this time send all my plagues upon thine heart,.... Not meaning particularly the plague of the hail, which next follows, so called, because it consisted of various things, as hail, rain, lightning, and thunder, as Aben Ezra, and who observes, that Pharaoh was more terrified with this plague than with any other; but rather all the plagues yet to come, for by them are not meant all the plagues that were in the power of God to inflict, which how many and great they are none can say, but all that he had determined in his mind to bring upon him; and these should not so much affect and afflict his body, as the boils and ulcers had the magicians, but should reach his heart, and fill h…