Exodus 8:20-32 - Plague Four: Flies
20 And the Lord said to Moses, Get up early in the morning and take your place before Pharaoh when he comes out to the water; and say to him, This is what the Lord says: Let my people go to give me worship. 21 For 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. 22 And 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. 23 And I will put a division between my people and your people; tomorrow this sign will be seen.
24 And 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. 25 And Pharaoh sent for Moses and Aaron and said, Go and make your offering to your God here in the land.
26 And 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. 27 But 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.
28 Then Pharaoh said, I will let you go to make an offering to the Lord your God in the waste land; but do not go very far away, and make prayer for me.
29 And Moses said, When I go out from you I will make prayer to the Lord that the cloud of flies may go away from Pharaoh and from his people and from his servants tomorrow: only let Pharaoh no longer by deceit keep back the people from making their offering to the Lord. 30 Then Moses went out from Pharaoh and made prayer to the Lord. 31 And the Lord did as Moses said, and took away the cloud of flies from Pharaoh and from his servants and from his people; not one was to be seen. 32 But again Pharaoh made his heart hard and did not let the people go.