And not the heavens alone rejoiced in the redemption of Israel, but also the mountains and all of the hills, the fruit trees and all of the cedars, viz. (Isaiah 44:23) "Sing, O heavens, for the L–rd has wrought! Shout, O depths of the earth. Mountains, break out in song, forest and all that is in it. For the L–rd has redeemed Yaakov", and (Ibid. 49:13) "Sing, O heavens and rejoice, O earth — Break out in song! For the L–rd has consoled His people, etc."