Cross Reference EXODUS 8:24 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

{Exodus 8:24} And the LORD 3068 did 6213 z8799 so; x3651 and there came 935 z8799 a grievous 3515 swarm 6157 [of flies] into the house 1004 of Pharaoh, 6547 and [into] his servants' 5650 houses, 1004 and into all x3605 the land 776 of Egypt: 4714 the land 776 was corrupted 7843 z8735 by reason y6440 of x4480 x6440 the swarm 6157 [of flies].

there:
"Else,¹ if¹ thou wilt not¹ let¹ my peopleª go,ª ° behold,¹ I will sendª °¹ swarmsª [of flies] upon thee, and upon thy servants,ª and upon thy people,ª and into thy houses:ª and the housesª of the Egyptiansª shall be fullª ° of¹ swarmsª [of flies], and also¹ the groundª whereon¹ ¹ they¹ [are]." {Exd 8:21} + "He sentª ° divers sorts of fliesª among them, which devouredª ° them; and frogs,ª which destroyedª ° them." {Psa 78:45} + "He spake,ª ° and there cameª ° divers sorts of flies,ª [and] liceª in all¹ their coasts.ª" {Psa 105:31}

the land:
How intolerable a plague of flies can prove, is evident from the fact that whole districts have been laid waste by them. The inhabitants have been forced to quit their cities, not being able to stand against the flies and gnats with which they were pestered. Hence different people had deities whose office it was to defend them against flies. Among these may be reckoned Baalzebub, the fly-god of Ekron; Hercules, muscarum abactor, Hercules the expeller of flies; and hence Jupiter had the titles of απομυιος, μυιαγρος, μυιοχορος, because he was supposed to expel flies, and especially clear his temples of these insects. See Bryant. "And they gathered them togetherª °¹ upon heaps:ª and the landª stank.ª °" {Exd 8:14}