Exodus 8:20-28

Now the LORD said to Moses, “Get up early in the morning and stand before Pharaoh as he is coming out to the water [of the Nile], and say to him, ‘Thus says the LORD, “Let My people go, so that they may serve Me. For if you do not let My people go, hear this: I will send swarms of [bloodsucking] insects on you and on your servants and on your people and into your houses; and the houses of the Egyptians will be full of swarms of insects, as well as the ground on which they stand. But on that day I will separate and set apart the land of Goshen, where My people are living, so that no swarms of insects will be there, so that you may know [without any doubt] and acknowledge that I, the LORD, am in the midst of the earth. I will put a division (distinction) between My people and your people. By tomorrow this sign shall be in evidence.” ’ ” Then the LORD did so. And there came heavy and oppressive swarms of [bloodsucking] insects into the house of Pharaoh and his servants’ houses; in all the land of Egypt the land was corrupted and ruined because of the [great invasion of] insects. Then Pharaoh called for Moses and Aaron and said, “Go, sacrifice to your God [here] in the land [of Egypt].” But Moses said, “It is not right [or even possible] to do that, for we will sacrifice to the LORD our God what is repulsive and unacceptable to the Egyptians [that is, animals that the Egyptians consider sacred]. If we sacrifice what is repulsive and unacceptable to the Egyptians, will they not riot and stone us? We must go a three days’ journey into the wilderness and sacrifice to the LORD our God as He commands us.” So Pharaoh said, “I will let you go, so that you may sacrifice to the LORD your God in the wilderness; only you shall not go very far away. Plead [with your God] for me.”