Isaiah 49:13

Sing, O heavens; and be joyful, O earth; and break forth into singing, O mountains: for the LORD hath comforted his people, and will have mercy upon his afflicted.

Ver. 13. Sing, O heavens.] a The prophet having thus foretold the saints' happiness in and by Christ, cannot hold, but breaketh forth into God's praises, calling into concert all creatures which since the fall have lain bedridden, as it were, looking with outstretched neck for their full deliverance. Rom 8:23

For the Lord hath comforted his people.] This is just matter of general joy.

a Enthusiastico iubilo, &c. - Oecolamp.