21For if you do not let my people go, see, I will send clouds of flies on you and on your servants and on your people and into their houses; and the houses of the Egyptians and the land where they are will be full of flies.
22And at that time I will make a division between your land and the land of Goshen where my people are, and no flies will be there; so that you may see that I am the Lord over all the earth.
23And I will put a division between my people and your people; tomorrow this sign will be seen.
24And the Lord did so; and great clouds of flies came into the house of Pharaoh and into his servants' houses, and all the land of Egypt was made waste because of the flies.
25And Pharaoh sent for Moses and Aaron and said, Go and make your offering to your God here in the land.
26And Moses said, It is not right to do so; for we make our offerings of that to which the Egyptians give worship; and if we do so before their eyes, certainly we will be stoned.
27But we will go three days' journey into the waste land and make an offering to the Lord our God as he may give us orders.
