Exodus 8:20-32 - Plague Four: Flies
20 The LORD told Moses, "Get up early in the morning and stand before Pharaoh as he's going down to the water. You are to say to him, "This is what the LORD says: "Let my people go so they can serve me. 21 But if you don't let my people go, I'll send swarms of insects upon you, your servants, your people, and your households. The houses of Egypt and even the ground on which they stand will be filled with swarms of insects. 22 On that day I'll treat the land of Goshen where my people live differently so that swarms of insects won't be there. As a result, you will know that I the LORD am in the midst of the land. 23 I'll make a distinction between my people and your people, and this sign will occur tomorrow."'"
24 The LORD did this, and dense swarms of insects came into the house of Pharaoh and into the houses of his servants. The land was ruined throughout Egypt because of the swarms of insects. 25 Then Pharaoh summoned Moses and Aaron and said, "Go, offer sacrifices to your God in the land."
26 "It wouldn't be right to sacrifice in this way," Moses replied, "because if we do, we will sacrifice to the LORD our God what is offensive to the Egyptians. If we offer sacrifices that are offensive to the Egyptians in front of them, they'll stone us, won't they? 27 We must go a three-day journey into the desert, and we'll offer sacrifices to the LORD our God just as he has told us."
28 Then Pharaoh said, "I'll let you go so you can offer sacrifices to the LORD your God in the desert. But you must not go very far away. Pray for me."
29 Moses said, "Right now I'm going to leave you, and I'll pray to the LORD that the swarms of insects may depart from Pharaoh, from his officials, and from his people tomorrow. But Pharaoh, don't continue lying by not letting the people go to offer sacrifices to the LORD." 30 Then Moses left Pharaoh's presence and prayed to the LORD. 31 The LORD did what Moses asked, and the swarms of insects departed from Pharaoh, his officials, and his people. Not one remained. 32 But this time also Pharaoh hardened his heart, and he did not let the people go.