And the LORD said unto Moses, Stretch out thine hand toward heaven, that there may be darkness over the land of Egypt, even darkness which may be {h} felt.

(h) Because it was so thick.

Wesley's Notes

10:21 We may observe concerning this plague. That it was a total darkness. We have reason to think, not only that the lights of heaven were clouded, but that all their fires and candles were put out by the damps or clammy vapours which were the cause of this darkness, for it is said, they saw not one another. That it was darkness which might be felt, felt in its causes by their finger - ends, so thick were the fogs, felt in its effects, (some think) by their eyes which were pricked with pain, and made the more sore by their rubbing them. Great pain is spoken of as the effect of that darkness, Rev 16:10, which alludes to this. No doubt it was very frightful and amazing. The tradition of the Jews is, that in this darkness they were terrified by the apparition of evil spirits, or rather by dreadful sounds and murmurs which they made; and this is the plague which some think is intended (for otherwise it is not mentioned at all there) Psa 78:49. He poured upon them the fierceness of his anger, by sending evil angels among them; for those to whom the devil has been a deceiver, he will at length be a terror to. It continued three days; six nights in one; so long they were imprisoned by those chains of darkness. No man rose from his place - They were all confined to their houses; and such a terror seized them, that few of them had the courage to go from the chair to the bed, or from the bed to the chair. Thus were they silent in darkness, 1Sam 2:9. Now Pharaoh had time to consider, if he would have improved it.

King James Translators' Notes

even...: Heb. that one may feel darkness

Jamieson-Fausset-Brown Bible Commentary

Ex 10:21-29. Plague of Darkness.

21-23. Stretch out thine hand toward heaven, that there may be darkness-Whatever secondary means were employed in producing it, whether thick clammy fogs and vapors, according to some; a sandstorm, or the chamsin, according to others; it was such that it could be almost perceived by the organs of touch, and so protracted as to continue for three days, which the chamsin does [Hengstenberg]. The appalling character of this calamity consisted in this, that the sun was an object of Egyptian idolatry; that the pure and serene sky of that country was never marred by the appearance of a cloud. And here, too, the Lord made a marked difference between Goshen and the rest of Egypt.

Matthew Henry's Concise Commentary

10:21-29 The plague of darkness brought upon Egypt was a dreadful plague. It was darkness which might be felt, so thick were the fogs. It astonished and terrified. It continued three days; six nights in one; so long the most lightsome palaces were dungeons. Now Pharaoh had time to consider, if he would have improved it. Spiritual darkness is spiritual bondage; while Satan blinds men's eyes that they see not, he binds their hands and feet, that they work not for God, nor move toward heaven. They sit in darkness. It was righteous with God thus to punish. The blindness of their minds brought upon them this darkness of the air; never was mind so blinded as Pharaoh's, never was air so darkened as Egypt. Let us dread the consequences of sin; if three days of darkness were so dreadful, what will everlasting darkness be? The children of Israel, at the same time, had light in their dwellings. We must not think we share in common mercies as a matter of course, and therefore that we owe no thanks to God for them. It shows the particular favour he bears to his people. Wherever there is an Israelite indeed, though in this dark world, there is light, there is a child of light. When God made this difference between the Israelites and the Egyptians, who would not have preferred the poor cottage of an Israelite to the fine palace of an Egyptian? There is a real difference between the house of the wicked, which is under a curse, and the habitation of the just, which is blessed. Pharaoh renewed the treaty with Moses and Aaron, and consented they should take their little ones, but would have their cattle left. It is common for sinners to bargain with God Almighty; thus they try to mock him, but they deceive themselves. The terms of reconciliation with God are so fixed, that though men dispute them ever so long, they cannot possibly alter them, or bring them lower. We must come to the demand of God's will; we cannot expect he should condescend to the terms our lusts would make. With ourselves and our children, we must devote all our worldly possessions to the service of God; we know not what use he will make of any part of what we have. Pharaoh broke off the conference abruptly, and resolved to treat no more. Had he forgotten how often he had sent for Moses to ease him of his plagues? and must he now be bid to come no more? Vain malice! to threaten him with death, who was armed with such power! What will not hardness of heart, and contempt of God's word and commandments, bring men to! After this, Moses came no more till he was sent for. When men drive God's word from them, he justly gives them up to their own delusions.