C. F. Keil and Franz Delitzsch on Exodus 9:3-5

Exo 9:3-5

“The hand of Jehovah will be (הויה, which only occurs here, as the participle of היה, generally takes its form from הוה, Neh 6:6; Ecc 2:22) against thy cattle...as a very severe plague (דּבר that which sweeps away, a plague), i.e., will smite them with a severe plague. A distinction was again made between the Israelites and the Egyptians. “Of all (the cattle) belonging to the children of Israel, not one (דּבּר Exo 9:4, = אחד Exo 9:6) shall die.” A definite time was also fixed for the coming of the plague, as in the case of the previous one (Exo 8:23), in order that, whereas murrains occasionally occur in Egypt, Pharaoh might discern in his one the judgment of Jehovah.