15  Wherefore they shall be high priests who are worthy, and they shall be appointed by the ^bFirst Presidency of the Melchizedek Priesthood, except they be literal descendants of Aaron.

  17  But as a high priest of the Melchizedek Priesthood has authority to officiate in all the lesser offices, he may officiate in the office of bishop when no literal descendant of Aaron can be found, provided he is called and set apart and ordained unto this power by the hands of the ^dPresidency of the Melchizedek Priesthood.

  9  The ^aPresidency of the High Priesthood, after the order of Melchizedek, have a right to officiate in all the offices in the church.