Exodus 8:19-21

Young's Literal Translation

¹⁹ and the scribes say unto Pharaoh, `It [is] the finger of God;' and the heart of Pharaoh is strong, and he hath not hearkened unto them, as Jehovah hath spoken.

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.