Doctrine and Covenants 128:22

Brethren, shall we not go on in so great a cause? Go forward and not backward. Courage, ^a brethren; and on, on to the victory! Let your hearts rejoice, and be exceedingly glad. Let the earth break forth into singing. ^b Let the dead ^c speak forth anthems of eternal praise to the King ^d Immanuel, who hath ordained, before the world was, that which would enable us to redeem ^e them out of their prison; ^f for the prisoners shall go free.