The threat of the locusts to eat what remained from the hail brought Pharaoh’s servants to their senses; but on the demand of Moses that all should go, old and young, children and cattle, to keep their feast to Jehovah (not a word of three days now), they are driven out from before the king, and the eighth blow falls all over the land. The powers of the air were at the command of Jehovah and against Egypt (Ex. 10:1-20).
So still more solemnly in the preternatural darkness of the ninth plague (Ex. 10:21-29). The sovereign who derived his name from the sun availed nothing for all the land of Egypt, while the darkness which might be felt was made visible in its source by the light which all the children of Israel had in their habitations.