Doctrine and Covenants 124: 91-95

91 And again, verily I say unto you, let my servant William be appointed, ordained, and anointed, as counselor unto my servant Joseph, in the room of my servant Hyrum, that my servant Hyrum may take the office of Priesthood and Patriarch, which was appointed unto him by his father, by blessing and also by right;

 92 That from henceforth he shall hold the keys of the patriarchal blessings upon the heads of all my people,

 93 That whoever he blesses shall be blessed, and whoever hecurses shall be cursed; that whatsoever he shall bind on earth shall be bound in heaven; and whatsoever he shall loose on earth shall be loosed in heaven.

 94 And from this time forth I appoint unto him that he may be a prophet, and a seer, and a revelator unto my church, as well as my servant Joseph;

 95 That he may act in concert also with my servant Joseph; and that he shall receive counsel from my servant Joseph, who shall show unto him the keys whereby he may ask and receive, and be crowned with the same blessing, and glory, and honor, and priesthood, and gifts of the priesthood, that once were put upon him that was my servant Oliver Cowdery;