He that feared... — Some impression, we see, had been made by the preceding plagues, and the warning was taken to some extent; but it was otherwise with many. So in Gospel times, “Some believed the things which were spoken, and some believed not” (Acts 28:24). The result was death, both to the cattle and their keepers (Exodus 9:19). (Comp. Joshua 10:11.)
Related Commentaries of Exodus 9:20
Exodus 9:20-21
20 He that feared the word of the LORD among the servants of Pharaoh made his servants and his cattle flee into the houses:
21 And he that regardeda not the word of the LORD left his servants and his cattle in the field.