Charles H. Spurgeon on Psalms 105:28

He sent darkness, and made it dark. It was no natural or common darkness to be accounted for by the blinding dust of the simoon, it was beyond all precedent and out of the range of ordinary events. It was a horrible palpable obscurity which men felt clinging about them as though it were a robe of death. It was a thick darkness, a total darkness, a darkness which lasted three days, a darkness in which no one dared to stir. What a condition to be in! This plague is first mentioned, thought it is not first in order, because it fitly describes all the period of the plagues: the land was in the darkness of sorrow, and in the darkness of sin all the time. If we shudder as we think of that long and terrible gloom, let us reflect upon the gross darkness which still covers heathen lands as the result of sin, for it is one of the chief plagues which iniquity creates for itself. May the day soon come when the people which sit in darkness shall see a great light. And they rebelled not against his word. Moses and Aaron did as they were bidden, and during the darkness the Egyptians were so cowed that even when it cleared away they were anxious for Israel to be gone, and had it not been for the pride of Pharaoh they would have rejoiced to speed them on their journey there and then. God can force men to obey, and even make the stoutest hearts eager to pay respect to his will, for fear his plagues should be multiplied. Possibly, however, the sentence before us neither refers to Moses nor the Egyptians, but to the plagues which came at the Lord's bidding. The darkness, the hail, the frogs, the murrain, were all so many obedient servants of the great Lord of all.