21 If you refuse, then I will send swarms of flies on you, your officials, your people, and all the houses. The Egyptian homes will be filled with flies, and the ground will be covered with them. 22 But this time I will spare the region of Goshen, where my people live. No flies will be found there. Then you will know that I am the Lord and that I am present even in the heart of your land. 23 I will make a clear distinction between my people and your people. This miraculous sign will happen tomorrow.'" 24 And the Lord did just as he had said. A thick swarm of flies filled Pharaoh's palace and the houses of his officials. The whole land of Egypt was thrown into chaos by the flies. 25 Pharaoh called for Moses and Aaron. "All right! Go ahead and offer sacrifices to your God," he said. "But do it here in this land." 26 But Moses replied, "That wouldn't be right. The Egyptians detest the sacrifices that we offer to the Lord our God. Look, if we offer our sacrifices here where the Egyptians can see us, they will stone us. 27 We must take a three-day trip into the wilderness to offer sacrifices to the Lord our God, just as he has commanded us." 28 "All right, go ahead," Pharaoh replied. "I will let you go into the wilderness to offer sacrifices to the Lord your God. But don't go too far away. Now hurry and pray for me." 29 Moses answered, "As soon as I leave you, I will pray to the Lord, and tomorrow the swarms of flies will disappear from you and your officials and all your people. But I am warning you, Pharaoh, don't lie to us again and refuse to let the people go to sacrifice to the Lord ." 30 So Moses left Pharaoh's palace and pleaded with the Lord to remove all the flies. 31 And the Lord did as Moses asked and caused the swarms of flies to disappear from Pharaoh, his officials, and his people. Not a single fly remained.
Matthew Henry's Commentary on Exodus 8:21-31
Commentary on Exodus 8:20-32
(Read Exodus 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.