Exodus 8:21-23

Young's Literal Translation

²¹ for, if thou art not sending My people away, lo, I am sending against thee, and against thy servants, and against thy people, and against thy houses, the beetle, and the houses of the Egyptians have been full of the beetle, and also the ground on which they are.

²² `And I have separated in that day the land of Goshen, in which My people are staying, that the beetle is not there, so that thou knowest that I [am] Jehovah in the midst of the land,

²³ and I have put a division between My people and thy people: to-morrow is this sign.'