Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[300] Accordingly, God punished his falseness with another plague, added to the former; for there arose out of the bodies of the Egyptians an innumerable quantity of lice, by which, wicked as they were, they miserably perished, as not able to destroy this sort of vermin either with washes or with ointments. At which terrible judgment the king of Egypt was in disorder, upon the fear into which he reasoned himself, lest his people should be destroyed, and that the manner of this death was also reproachful, so that he was forced in part to recover himself from his wicked temper to a sounder mind, for he gave leave for the Hebrews themselves to depart. But when the plague thereupon ceased, he thought it proper to require that they should leave their children and wives behind them, as pledges of their return; whereby he provoked God to be more vehemently angry at him, as if he thought to impose on his providence, and as if it were only Moses, and not God, who punished the Egyptians for the sake of the Hebrews: for he filled that country full of various sorts of pestilential creatures, with their various properties, such indeed as had never come into the sight of men before, by whose means the men perished themselves, and the land was destitute of husbandmen for its cultivation; but if any thing escaped destruction from them, it was killed by a distemper which the men underwent also.