Exodus 8:21-23

Wycliffe Bible

²¹ that if thou wilt not deliver the people (but if thou wilt not let the people go), lo! I shall send into thee, and into thy servants, and into thy people, and into thine houses, all the kind(s) of flies; and the houses of the Egyptians shall be full-filled with flies of diverse kinds, and all the land in which they shall be.

²² And in that day I shall make wonderful the land of Goshen, in which my people is, that flies be not there; and that thou know that I am the Lord in the midst of [the] earth; (But on that day I shall protect the land of Goshen, where my people be, so that there shall be no flies there; and so that thou shalt know that I, the Lord, am in the midst of the land;)

²³ and I shall set parting betwixt my people and thy people; this sign shall be tomorrow (this miracle shall come tomorrow).