A very grievous hail - The miracle consisted in the magnitude of the infliction and in its immediate connection with the act of Moses.

To-morrow about this time - The time of this plague is marked thus circumstantially to show Pharaoh that Jehovah was Lord of heaven and earth, and that the water, the fire, the earth, and the air, which were all objects of Egyptian idolatry, were the creatures of his power; and subservient to his will; and that, far from being able to help them, they were now, in the hands of God, instruments of their destruction.

To rain a very grievous hail - To rain hail may appear to some superficial observers as an unphilosophical mode of expression, but nothing can be more correct. "Drops of rain falling through a cold region of the atmosphere are frozen and converted into hail;" and thus the hail is produced by rain. When it begins to fall it is rain; when it is falling it is converted into hail; thus it is literally true that it rains hail. The farther a hail-stone falls the larger it generally is, because in its descent it meets with innumerable particles of water, which, becoming attached to it, are also frozen, and thus its bulk is continually increasing till it reaches the earth. In the case in question, if natural means were at all used, we may suppose a highly electrified state of an atmosphere loaded with vapors, which, becoming condensed and frozen, and having a considerable space to fall through, were of an unusually large size. Though this was a supernatural storm, there have been many of a natural kind, that have been exceedingly dreadful. A storm of hail fell near Liverpool, in Lancashire, in the year 1795, which greatly damaged the vegetation, broke windows, etc., etc. Many of the stones measured five inches in circumference. Dr. Halley mentions a similar storm of hail in Lancashire, Cheshire, etc., in 1697, April 29, that for sixty miles in length and two miles in breadth did immense damage, by splitting trees, killing fowls and all small animals, knocking down men and horses, etc., etc. Mezeray, in his History of France, says "that in Italy, in 1510, there was for some time a horrible darkness, thicker than that of night, after which the clouds broke into thunder and lightning, and there fell a shower of hail-stones which destroyed all the beasts, birds, and even fish of the country. It was attended with a strong smell of sulphur, and the stones were of a bluish color, some of them weighing one hundred pounds' weight." The Almighty says to Job: "Hast thou seen the treasures of the hail, which I have reserved against the time of trouble, against the day of battle and war?" Job 38:22, Job 38:23. While God has such artillery at his command, how soon may he desolate a country or a world! See the account of a remarkable hail-storm in Joshua 10:11.

Behold, tomorrow about this time,.... It was now the fourth day of the month Abib, and the fifth when the following was inflicted:

I will cause it to rain a very grievous hail; which should fall very thick, and the hailstones be very numerous and heavy, and the storm last long:

such as hath not been in Egypt since the foundation thereof, even until now; not since the earth or land itself was founded, for that was founded when the rest of the world was, and the sense then would be the same as since the foundation of the world; and so the Targum of Jonathan seems to understand it, paraphrasing the words,"from the day that men were made, even until now.''And a like expression is used of a storm of hail, thunder, and lightning, and earthquakes yet to come, which will be such as has not been since men were upon the earth, with which this plague may be compared, Revelation 16:19, but here is meant since Egypt was inhabited, or rather formed into a kingdom, and founded as such, which had been many hundreds of years before this time; there was a king of Egypt in Abraham's time; the first founder of this empire, and king of it, was Mizraim, the son of Ham, from whom it had its name, by which it is usually called in Scripture. This supposes that it did sometimes rain in Egypt, contrary to a vulgar notion, or otherwise there would have been no room for the comparison; though it must be owned that rain is rare in Egypt, especially in some parts of it; See Gill on Zechariah 14:18.

Behold, to morrow about this time I will cause it to rain a very grievous hail, such as hath not been in Egypt since the foundation thereof even until now.

9:18 Since the foundation thereof - Since it was a kingdom.

Ex 9:18-35. Plague of Hail.

18. I will cause it to rain a very grievous hail, &c.-The seventh plague which Pharaoh's hardened heart provoked was that of hail, a phenomenon which must have produced the greatest astonishment and consternation in Egypt as rain and hailstones, accompanied by thunder and lightning, were very rare occurrences.

such as hath not been in Egypt-In the Delta, or lower Egypt, where the scene is laid, rain occasionally falls between January and March-hail is not unknown, and thunder sometimes heard. But a storm, not only exhibiting all these elements, but so terrific that hailstones of immense size fell, thunder pealed in awful volleys, and lightning swept the ground like fire, was an unexampled calamity.

9:13-21 Moses is here ordered to deliver a dreadful message to Pharaoh. Providence ordered it, that Moses should have a man of such a fierce and stubborn spirit as this Pharaoh to deal with; and every thing made it a most signal instance of the power of God has to humble and bring down the proudest of his enemies. When God's justice threatens ruin, his mercy at the same time shows a way of escape from it. God not only distinguished between Egyptians and Israelites, but between some Egyptians and others. If Pharaoh will not yield, and so prevent the judgment itself, yet those that will take warning, may take shelter. Some believed the things which were spoken, and they feared, and housed their servants and cattle, and it was their wisdom. Even among the servants of Pharaoh, some trembled at God's word; and shall not the sons of Israel dread it? But others believed not, and left their cattle in the field. Obstinate unbelief is deaf to the fairest warnings, and the wisest counsels, which leaves the blood of those that perish upon their own heads.