What Does Exodus 9:9 Mean?

"It shall become fine dust over all the land of Egypt, and become boils breaking out in sores on man and beast throughout all the land of Egypt." The transformation of soot into dust and dust into boils is announced in verse 9: the soot Moses throws up will disperse as fine dust across all of Egypt, and that dust will cause boils that break out as sores on every person and animal in Egypt. The phrase "on man and beast" is the same cross-species scope as the gnat plague (Exodus 8:17): the plague touches every living body in Egypt, human and animal alike, without regard to social status.

The boils (Hebrew: shechin, inflammatory skin disease producing erupting sores) are the first plague in the sequence that directly attacks the human body rather than the environment, the animal population, or the food supply. Previous plagues were environmental catastrophes; the boil plague is a bodily one. The escalation from environmental affliction to bodily affliction marks the second half of the plague sequence as progressively more personal in its impact. What began as a Nile turned to blood, a horrifying public sign, has escalated to a disease covering the bodies of every Egyptian.

The "breaking out in sores" language (Hebrew: avabut porach, literally "blisters/pustules bursting") describes an acute inflammatory skin condition with open, weeping sores. The image is one of uncontrollable, body-wide eruption: the sores break out of their own accord, covering the body with painful, open blisters. The sixth plague makes every Egyptian unable to ignore their bodily condition: the plague that enters the skin cannot be conceptually set aside the way the blood-Nile or even the flies could be dismissed and walked away from. The boils are not outside the body; they are on it.