C. F. Keil and Franz Delitzsch on Exodus 9:17-18

Exo 9:17-18

The seventh plague. - To break down Pharaoh’s opposition, Jehovah determined to send such a Hail as had not been heard of since the founding of Egypt, accompanied by thunder and masses of fire, and to destroy every man and beast that should be in the field. מסתּולל עודך: “thou still dammest thyself up against My people.” הסתּולל: to set one’s self as a dam, i.e., to oppose; from סלל, to heap up earth as a dam or rampart. “To-morrow about this time,” to give Pharaoh time for reflection. Instead of “from the day that Egypt was founded until now,” we find in Exo 9:24 “since it became a nation,” since its existence as a kingdom or nation.