Exodus 8:21–22

21 But if you are not about to release my people, look, I am about to send out flies among you and among your servants and among your people and in your houses; and the houses of Egypt will fill up with the flies and also the ground that they are on. 22 But on that day I will distinguishg the land of Goshen, where my people are staying, by there not being flies there, so that you will know that I am Yahweh in the midst of the land.

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