Exodus 8: 20 And the Lord said unto Moses, Rise up early in the morning, and stand before Pharaoh he cometh forth to the water; and say unto him, Thus saith the Lord, Let my people go, that they may serve me.
Exodus 8: 24 And the Lord did this. Dense swarms of flies poured into Pharaoh’s palace and into the houses of his officials; throughout Egypt, the land was ruined by the flies.
Exodus 8: 32 Then Moses left Pharaoh and prayed to the Lord, and the Lord did what Moses asked. The flies left Pharaoh and his officials and his people; not a fly remained. But this time also Pharaoh heart and would not let the people go.