The land was corrupted - Every thing was spoiled, and many of the inhabitants destroyed, being probably stung to death by these venomous insects. This seems to be intimated by the psalmist, "He sent divers sorts of flies among them, which Devoured them," Psalm 78:45.

In ancient times, when political, domestic, and personal cleanliness was but little attended to, and offal of different kinds permitted to corrupt in the streets and breed vermin, flies multiplied exceedingly, so that we read in ancient authors of whole districts being laid waste by them; hence different people had deities, whose office it was to defend them against flies. Among these we may reckon Baalzebub, the fly-god of Ekron; Hercules, muscarum abactor, Hercules, the expeller of flies, of the Romans; the Muagrus of the Eleans, whom they invoked against pestilential swarms of flies; and hence Jupiter, the supreme god of the heathens, had the epithets of Απομυιος and Μυωδης, because he was supposed to expel flies, and defend his worshippers against them. See Dodd.

And the Lord did so,.... And this he did immediately of himself without any means; not by the rod of Aaron, to let the Egyptians see that there was nothing in that rod, that it had no magic virtue in it, and what was done by it was from the Lord himself, who could as well inflict plagues without it as with it; see Psalm 105:31 and there came a grievous swarm of flies; or a "heavy" (q) one, which was both very numerous, and very troublesome and distressing:

into the house of Pharaoh, and into the houses of his servants, and into all the land of Egypt: into the palace of Pharaoh, and into the palaces of his nobles, ministers, and courtiers, and into the dwelling places of all his subjects, throughout the whole land, excepting the land of Goshen:

the land was corrupted by reason of the swarm of flies; Josephus (r) says, the land lay neglected and uncultivated by the husbandmen; it may be, the air was infected by the flies, which produced a pestilence that took off many of the inhabitants; so among the Eleans, as Pliny (s) reports, a multitude of flies produced a pestilence; however, it is certain many of the inhabitants of Egypt perished by them; they might sting them to death, suck their blood, and poison them with their envenomed stings; see Psalm 78:45.

(q) "gravis", Montanus, "gravissime", V. L. (r) Ut supra. (Antiqu. l. 2. c. 14. sect. 3.) (s) Nat. Hist. l. 10. c. 28.

This plague, by which the land was destroyed (תּשּׁחת), or desolated, inasmuch as the flies not only tortured, "devoured" (Psalm 78:45) the men, and disfigured them by the swellings produced by their sting, but also killed the plants in which they deposited their eggs, so alarmed Pharaoh that he sent for Moses and Aaron, and gave them permission to sacrifice to their God "in the land." But Moses could not consent to this restriction. "It is not appointed so to do" (נכון does not mean aptum, conveniens, but statutum, rectum), for two reasons: (1) because sacrificing in the land would be an abomination to the Egyptians, and would provoke them most bitterly (Exodus 8:26); and (2) because they could only sacrifice to Jehovah their God as He had directed them (Exodus 8:27). The abomination referred to did not consist in their sacrificing animals which the Egyptians regarded as holy. For the word תּועבה (abomination) would not be applicable to the sacred animals. Moreover, the cow was the only animal offered in sacrifice by the Israelites, which the Egyptians regarded as sacred. The abomination would rather be this, that the Iran would not carry out the rigid regulations observed by the Egyptians with regard to the cleanness of the sacrificial animals (vid., Hengstenberg, p. 114), and in fact would not observe the sacrificial rites of the Egyptians at all. The Egyptians would be very likely to look upon this as an insult to their religion and their gods; "the violation of the recognised mode of sacrificing would be regarded as a manifestation of contempt for themselves and their gods" (Calvin), and this would so enrage them that they would stone the Israelites. The הן before נזבּח in Exodus 8:26 is the interjection lo! but it stands before a conditional clause, introduced without a conditional particle, in the sense of if, which it has retained in the Chaldee, and in which it is used here and there in the Hebrew (e.g., Leviticus 25:20).

And the LORD did so; and there came a grievous swarm of flies into the house of Pharaoh, and into his servants' houses, and into all the land of Egypt: the land was corrupted by reason of the swarm of flies.

8:24 There came a grievous swarm of flies - The prince of the power of the air has gloried in being Beel - zebub, the god of flies; but here it is proved that even in that he is a pretender, and an usurper; for even with swarms of flies God fights against his kingdom and prevails.

corrupted: or, destroyed

8:20-32 Pharaoh was early at his false devotions to the river; and shall we be for more sleep and more slumber, when any service to the Lord is to be done? The Egyptians and the Hebrews were to be marked in the plague of flies. The Lord knows them that are his, and will make it appear, perhaps in this world, certainly in the other, that he has set them apart for himself. Pharaoh unwillingly entered into a treaty with Moses and Aaron. He is content they should sacrifice to their God, provided they would do it in the land of Egypt. But it would be an abomination to God, should they offer the Egyptian sacrifices; and it would be an abomination to the Egyptians, should they offer to God the objects of the worship of the Egyptians, namely, their calves or oxen. Those who would offer acceptable sacrifice to God, must separate themselves from the wicked and profane. They must also retire from the world. Israel cannot keep the feast of the Lord, either among the brick-kilns or among the flesh-pots of Egypt. And they must sacrifice as God shall command, not otherwise. Though they were in slavery to Pharaoh, yet they must obey God's commands. Pharaoh consents for them to go into the wilderness, provided they do not go so far but that he might fetch them back again. Thus, some sinners, in a pang of conviction, part with their sins, yet are loth they should go very far away; for when the fright is over, they will turn to them again. Moses promised the removal of this plague. But let not Pharaoh deal deceitfully any more. Be not deceived; God is not mocked: if we think to cheat God by a sham repentance and a false surrender of ourselves to him, we shall put a fatal cheat upon our own souls. Pharaoh returned to his hardness. Reigning lusts break through the strongest bonds, and make men presume and go from their word. Many seem in earnest, but there is some reserve, some beloved, secret sin. They are unwilling to look upon themselves as in danger of everlasting misery. They will refrain from other sins; they do much, give much, and even punish themselves much. They will leave it off sometimes, and, as it were, let their sin depart a little way; but will not make up their minds to part with all and follow Christ, bearing the cross. Rather than that, they venture all. They are sorrowful, but depart from Christ, determined to keep the world at present, and they hope for some future season, when salvation may be had without such costly sacrifices; but, at length, the poor sinner is driven away in his wickedness, and left without hope to lament his folly.