20 Then the Lord said to Moses, Rise up early in the morning and stand before Pharaoh as he comes forth to the water; and say to him, Thus says the Lord, Let My people go, that they may serve Me.
21 Else, if you will not let My people go, behold, I will send swarms [of bloodsucking gadflies] upon you, your servants, and your people, and into your houses; and the houses of the Egyptians shall be full of swarms [of bloodsucking gadflies], and also the ground on which they stand.
22 But on that day I will sever and set apart the land of Goshen in which My people dwell, that no swarms [of gadflies] shall be there, so that you may know that I am the Lord in the midst of the earth.
23 And I will put a division and a sign of deliverance between My people and your people. By tomorrow shall this sign be in evidence.
24 And the Lord did so; and there came heavy and oppressive swarms [of bloodsucking gadflies] into the house of Pharaoh and his servants' houses; and in all of Egypt the land was corrupted and ruined by reason of the great invasion [of gadflies].
25 And Pharaoh called for Moses and Aaron, and said, Go, sacrifice to your God [here] in the land [of Egypt].
26 And Moses said, It is not suitable or right to do that; for the animals the Egyptians hold sacred and will not permit to be slain are those which we are accustomed to sacrifice to the Lord our God; if we did this before the eyes of the Egyptians, would they not stone us?