Jerome : (Verse 5, 6.) For before the harvest it had flowered entirely, and immature perfection had sprouted, and its small branches will be cut with sickles, and whatever has been left behind will be cut off and shaken off. And they will be left with the birds of the mountains and the animals of the earth, and they will have perpetual summer over them, and all the animals of the earth will winter upon it. Because he had said of the south wind, and had sent a cloud of dew before summer and harvest, and had taken produce from the field, he will preserve it in the remains, describing the pride of Egypt and the devastation of its people, and the corpses throughout the province, which will be devoured by the birds. For just as the crops that spring up before maturity quickly perish, and the sprouts that germinate are useless before the proper time of growth comes; so, he says, the Egyptian people are cut down like useless branches with the sickle, and all their offspring will be stripped bare. And lest you think that he is speaking of the vineyard and not of men, he turns the metaphor into historical truth: And they shall be abandoned together to the birds of the mountains and to the beasts of the earth. For birds and beasts do not eat the severed branches of trees, but rather devour corpses. Let us read more fully Ezekiel, where he prophesies against Pharaoh and against Egypt: and all these things we will find written very clearly (Ezek. XXIX). And he says: In perpetual summer, birds shall be above him, and all beasts shall winter upon him; either this signifies a multitude of those who will be slain, or by the same interpretation it shows that he will be laid waste by all nations. — Commentary on Isaiah