Moses
Exodus 8:21ESV·traditional attribution

Or else, if you will not let my people go, behold, I will send swarms of flies on you and your servants and your people, and into your houses. And the houses of the Egyptians shall be filled with swarms of flies, and also the ground on which they stand.

Matthew Henry Presbyterian @wholebiblehenry

Here is the story of the plague of flies, in which we are told, I. How it was threatened, like that of frogs, before it was inflicted. Moses is directed (Exo 8:20) to rise early in the morning, to meet Pharaoh when he came forth to the water, and there to repeat his demands. Note, 1.

Commenting on Exodus 8:20-32

John Gill Reformed Baptist @doctorgill

And I will sever in that day the land of Goshen, in which my people dwell,.... Distinguish it from other parts of the land of Egypt: that no swarms of flies shall be there; which was a very wonderful thing, and so the word may be rendered.

Jamieson-Fausset-Brown Reformed @jfbcommentary

PLAGUE OF FLIES. (Exo 8:20-32) Rise up early . . . Pharaoh; lo, he cometh forth to the water, &c.--Pharaoh still appearing obdurate, Moses was ordered to meet him while walking on the banks of the Nile and repeat his request for the liberation of Israel, threatening in case of continued refusal to cover every house from the palace to the cottage with swarms of...

Commenting on Exodus 8:20-32