Now, this explanation has one advantage over that of dogflies—that special mention is made of their afflicting “the ground whereon they are” (ver. 21), which is less suitable to a plague of flies. But it may be that no one creature is meant. The Hebrew word means “a mixture.” Jewish interpreters have gone so far as to make it mean “all kinds of noxious animals and serpents and scorpions mixed together,” and although it is palpably absurd to believe that Pharaoh should have survived if these had been upon him and upon his servants, yet the expression “a mixture,” following after one kind of vermin had tormented the land, need not be narrowed too exactly. With deliberate particularity the king was warned that they should come “upon thee, and upon thy servants, and upon thy people, and into thine houses, and the houses of the Egyptians shall be full of [them[15]], and also the ground whereon they are.” It has been supposed, from the special mention of the exemption of the land of Goshen, that this was a new thing. We have seen reason, however, to think otherwise, and the emphatic assertion now made is easy to understand. The plague was especially to be expected in low flat ground: the king may not even have been aware of the previous freedom of Israel; and in any case its importance as an evidence had not been pressed upon him. The spirit of the seventy-eighth Psalm, though not perhaps any one specific phrase, contrasts the earlier as well as the later plagues with the protection of His own people, whom He led like sheep (vers. 42–52).