Encyclopedie , International Standard Bible Encyclopedia, , [1915], Fly, The other word, zebhubh, occurs in Ec 10:1, "Dead flies cause the oil of the perfumer to send forth an evil odor; so doth a little folly outweigh wisdom and honor"; and Isa 7:18, "And it shall come to pass in that day, that Yahweh will hiss for the fly that is in the uttermost part of the rivers of Egypt, and for the bee that is in the land of Assyria:" The house fly would fit perfectly the reference in each, but that in Isa would seem to suggest rather one of the horse flies (Tabanidae) or gad flies (Oestridae). Whatever fly may be meant, it is used as a symbol for the military power of Egypt, as the bee for that of Assyria. (Alfred Ely Day, "Fly, flies"