Exodus 8:23-25

Darby Translation

²³ And I will put a separation between my people and thy people; to-morrow shall this sign be.

²⁴ And Jehovah did so; and there came dog-flies in a multitude into the house of Pharaoh, and [into] the houses of his bondmen; and throughout the land of Egypt, the land was corrupted by the dog-flies.

²⁵ And Pharaoh called Moses and Aaron, and said, Go, sacrifice to your God in the land.