Barnes' Notes on the Whole Bible

A very grievous murrain - Or “pestilence;” but the word “murrain,” i. e. “a great mortality,” exactly expresses the meaning. This terrible visitation struck far more severely than the preceding, which had caused distress and suffering; it attacked the resources of the nation.

The camels - These animals are only twice mentioned, here and Genesis 12:16, in connection with Egypt. Though camels are never represented on the monuments, they were known to the Egyptians, and were probably used on the frontier.

All the cattle - i. e. which were left in the field; compare Exodus 9:19-21.

Was hardened - See Exodus 4:21. Pharaoh probably attributed the exemption of the Israelites to natural causes. They were a pastoral race, well acquainted with all that pertained to the care of cattle; and dwelling in a healthy district probably far more than the rest of Lower Egypt.

This marks a distinct advance and change in the character of the visitations. Hitherto, the Egyptians had not been attacked directly in their persons. It is the second plague which was not preceded by a demand and warning, probably on account of the special hardness shown by Pharaoh in reference to the murrain.

Ashes of the furnace - The act was evidently symbolic: the ashes were to be sprinkled toward heaven, challenging, so to speak, the Egyptian deities. There may possibly be a reference to an Egyptian custom of scattering to the winds ashes of victims offered to Typhon.

A boil - Means probably a burning tumor or carbuncle breaking out in pustulous ulcers. The miracle consisting in the severity of the plague and its direct connection with the act of Moses.

This verse seems to imply that the magicians now formally gave way and confessed their defeat.

Rie - Rather, “spelt,” the common food of the ancient Egyptians, now called “doora” by the natives, and the only grain represented on the sculptures: the name, however, occurs on the monuments very frequently in combination with other species.

Hardened - Different words in the Hebrew. In Exodus 9:34 the word means “made heavy,” i. e. obtuse, incapable of forming a right judgment; in Exodus 9:35 it is stronger, and implies a stubborn resolution.