Exodus 10:21

“And the Lord said unto Moses, etc.] About the eleventh day of the month Abib: stretch out thine hand toward heaven; where the luminaries are, and from whence light comes: that there may be darkness over the land of Egypt, even darkness which may be felt; that is, what caused it, the gross vapours and thick fogs; for otherwise darkness itself, being a privation of light, cannot be felt: Onkelos paraphrases it, “after that the darkness of the night is removed;” so Jonathan; that it might appear to be different from that, and be much grosser.”

“PLAGUE OF DARKNESS. (Exo 10:21-29) 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…”

“Darkness - This infliction was specially calculated to affect the spirits of the Egyptians, whose chief object of worship was the Sun-god; and its suddenness and severity in connection with the act of Moses mark it as a preternatural withdrawal of light. Yet, it has an analogy in physical phenomena. After the vernal equinox the southwest wind from the desert blows some 50 days, not however, continuously but at intervals, lasting generally some two or three days. It fills the atmosphere with dense masses of fine sand, bringing on a darkness far deeper than that of our worst fogs in winter. The consternation of Pharaoh proves that, familiar as he may have been with the phenomenon, no previous…”

“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…”

“10:21-29 The ninth plague was the plague of darkness (10:21). The chief god of Egypt through the centuries, who appeared under several different names, was the sun. At this time he was known as Amon-Re. He was supreme over all the other gods and was considered to be the ultimate source of life. The Lord showed that the sun’s light is completely under his control; he could shut it off from Egypt proper, while leaving it to shine in Goshen in the northeast part of the country (10:23; see study note on 9:1-7).”

“Stretch: Exo 9:22 darkness: As the Egyptians not only worshipped the light and sun, but also paid the same veneration to night and darkness, nothing could be more terrible than this punishment of palpable and coercive darkness, such as their luminary Osiris could not dispel. See Bryant, pp. 141-160. Psa 35:6, Psa 78:49, Psa 105:28; Pro 4:19; Ecc 2:14, Ecc 6:4; Isa 8:21, Isa 8:22; Mat 27:45; Mar 15:33; Luk 23:44; Pe2 2:4, Pe2 2:17; Jde 1:6, Jde 1:13; Rev 16:10, Rev 16:11 even darkness which may be felt: Heb. that one may feel darkness Exodus 10:22”

“Ninth plague: The Darkness. - As Pharaoh's defiant spirit was not broken yet, a continuous darkness came over all the land of Egypt, with the exception of Goshen, without any previous announcement, and came in such force that the darkness could be felt. חשׁך וימשׁ: "and one shall feel, grasp darkness." המשׁ: as in Psa 115:7; Jdg 16:26, ψηλαφητὸν σκότος (lxx); not "feel in the dark," for משׁשׁ has this meaning only in the Piel with בּ ( Deu 28:29). אפלה חשׁך: darkness of obscurity, i.e., the deepest darkness. The combination of two words or synonyms gives the greatest intensity to the thought. The darkness was so great that they could not see one another, and no one rose up from his place.…”