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.
26 And Moses said: It cannot be so: for we shall sacrifice the abominations of the Egyptians to the Lord our God: now if we kill those things which the Egyptians worship, in their presence, they will stone us.
27 We will go three days' journey into the wilderness: and we will sacrifice to the Lord our God, as he hath commanded us.
28 And Pharao said: I will let you go to sacrifice to the Lord your God in the wilderness: but go no farther: pray for me.
29 And Moses said: I will go out from thee, and will pray to the Lord: and the flies shall depart from Pharao, and from his servants, and from his people to morrow: but do not deceive any more, in not letting the people go to sacrifice to the Lord.