Exodus 8:17-19

New Catholic Bible

¹⁷ If you do not let my people go, then I will send flies^[a] upon you, upon your ministers, upon your people, and upon your houses. The houses of Egypt will be filled with flies, and even the ground on which they stand will be filled with them. ¹⁸ But on that day I will set apart the land of Goshen where my people live. There will be no flies there, so that you will know that I, the Lord, am in the land. ¹⁹ Thus I will establish a difference between my people and your people. This sign will happen tomorrow.” ’ ”