Isaiah 44:23

Isaiah 44:23. Sing, O ye heavens, for the LORD hath done it: shout, ye lower parts of the earth: break forth into singing, ye mountains, O forest, and every tree therein: for the LORD hath redeemed Jacob, and glorified himself in Israel.

Pardoned sin is enough to make even the rocks sing; mountains, trees, forests, and even the lower parts of the earth, are made to echo with song when sin is blotted out.