In Context

20 The Lord also said to Moses: Arise early, and stand before Pharao: for he will go forth to the waters: and thou shalt say to him: Thus saith the Lord: Let my people go to sacrifice to me.

21 But if thou wilt not let them go, behold I will send in upon thee, and upon thy servants, and upon thy houses all kind of flies: and the houses of the Egyptians shall be filled with flies of divers kinds, and the whole land wherein they shall be.

22 And I will make the land of Gessen wherein my people is, wonderful in that lay, so that flies shall not be there: and thou shalt know that I am the Lord in the midst of the earth.

23 And I will put a division between my people and thy people: to morrow shall this sign be.

24 And the Lord did so. And there came a very grievous swarm of flies into he houses of Pharao and of his servants, and into all the land of Egypt: and the land was corrupted by this kind of flies.

25 And Pharao called Moses and Aaron, and said to them: Go, and sacrifice to your God in this land.

Exodus 8:23 in Other Translations