Exodus 8:24-27

24And the Lord did just as he had said. A thick swarm of flies filled Pharaoh’s palace and the houses of his officials. The whole land of Egypt was thrown into chaos by the flies.

25Pharaoh called for Moses and Aaron. “All right! Go ahead and offer sacrifices to your God,” he said. “But do it here in this land.”

26But Moses replied, “That wouldn’t be right. The Egyptians detest the sacrifices that we offer to the Lord our God. Look, if we offer our sacrifices here where the Egyptians can see us, they will stone us.

27We must take a three-day trip into the wilderness to offer sacrifices to the Lord our God, just as he has commanded us.”