Moses
Exodus 9:21BSB·traditional attribution

but those who disregarded the word of the LORD left their servants and livestock in the field.

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. A general declaration of the wrath of God against Pharaoh for his obstinacy. Though God has hardened his heart (Exo 9:12), yet Moses must repeat his applications to him; God suspends his grace and yet demands obedience, to punish him for requiring bricks of the children of Israel when he denied them straw.

Commenting on Exodus 9:13-21

John Gill Reformed Baptist @doctorgill

And he that regarded not the word of the Lord,.... Or "set not his heart" (f) "unto it", took no notice of it, but treated it with the utmost contempt; and of this sort it may be thought there were the far greatest number: everyone of this cast left his servants and cattle in the field; let them remain there, and took no care of...

Jamieson-Fausset-Brown Reformed @jfbcommentary

PLAGUE OF HAIL. (Exo. 9:18-35) I will cause it to rain a very grievous hail, &c.--The seventh plague which Pharaoh's hardened heart provoked was that of hail, a phenomenon which must have produced the greatest astonishment and consternation in Egypt as rain and hailstones, accompanied by thunder and lightning, were very rare occurrences.

Commenting on Exodus 9:18-35