The heavens — The heavens and earth shall pass away, in regard of their present state, and properties, and use, as smoak is said to vanish, tho' the substance of it be not destroyed.
Related Commentaries of Isaiah 51:6
Isaiah 51:6
6 Lift up your eyes to the heavens, and look upon the earth beneath: for the heavens shall vanish away like smoke, and the earth shall wax old like a garment, and they that dwell therein shall die in like manner: but my salvation shall be for ever, and my righteousness shall not be abolished.