Exodus 8:14-16

Young's Literal Translation

¹⁴ and they heap them up together, and the land stinketh.

¹⁵ And Pharaoh seeth that there hath been a respite, and he hath hardened his heart, and hath not hearkened unto them, as Jehovah hath spoken.

¹⁶ And Jehovah saith unto Moses, `Say unto Aaron, Stretch out thy rod, and smite the dust of the land, and it hath become gnats in all the land of Egypt.'