68:15 Wherefore they shall be high priests who are worthy, and they shall be appointed by the First Presidency of the Melchizedek Priesthood, except they be literal descendants of Aaron.

 68:16 And if they be literal descendants of Aaron they have a legal right to the bishopric, if they are the firstborn among the sons of Aaron;

 68:17 For the firstborn holds the right of the presidency over this priesthood, and the keys or authority of the same.

 68:18 No man has a legal right to this office, to hold the keys of this priesthood, except he be a literal descendant and the firstborn of Aaron.

 68:19 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, under the hands of the First Presidency of the Melchizedek Priesthood.

 68:20 And a literal descendant of Aaron, also, must be designated by this Presidency, and found worthy, and anointed, and ordained under the hands of this Presidency, otherwise they are not legally authorized to officiate in their priesthood.