They shall be left together unto the fowls of the mountains, and to the beasts of the earth: and the fowls shall summer upon them, and all the beasts of the earth shall winter upon them.
6. They shall be left together. {Bogus footnote} He means that they will be cast aside as a thing of no value, as John the Baptist also compares them to chaff, which is thrown on the dunghill. (Matthew 3:12; Luke 3:17.) Thus Isaiah shews that they will be exposed to the wild beasts and to the fowls, so that the fowls will nestle in them...
Interpreters are very much at a loss where to find this land that lies beyond the rivers of Cush. Some take it to be Egypt, a maritime country, and full of rivers, and which courted Israel to depend upon them, but proved broken reeds; but against this it is strongly objected that the next chapter is distinguished from this by the title of the burden of Egypt.
Commenting on Isaiah 18:1-7
They shall be left, together unto the fowls of the mountains, and to the beasts of the earth,.... That is, both sprigs and branches; with the fruit of them, which being unripe, are disregarded by men, but fed upon by birds and beasts; the fruits by the former, and the tender sprigs and green branches by the latter; signifying the destruction of the Ethiopians or...