'Sky' in the Bible

And all the host of heaven will wear away,And the sky will be rolled up like a scroll;All their hosts will also wither awayAs a leaf withers from the vine,Or as one withers from the fig tree.

“Lift up your eyes to the sky,Then look to the earth beneath;For the sky will vanish like smoke,And the earth will wear out like a garmentAnd its inhabitants will die in like manner;But My salvation will be forever,And My righteousness will not wane.