Exodus 8:20-22

Young's Literal Translation

²⁰ And Jehovah saith unto Moses, `Rise early in the morning, and station thyself before Pharaoh, lo, he is going out to the waters, and thou hast said unto him, Thus said Jehovah, Send My people away, and they serve Me;

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,