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

  30 And again, the offices of ^ateacher and deacon are necessary appendages belonging to the lesser priesthood, which priesthood was confirmed upon ^bAaron and his sons.

  59 Verily, if a man be called of my Father, as was ^aAaron, by mine own voice, and by the voice of him that ^bsent me, and I have endowed him with the ^ckeys of the power of this priesthood, if he do anything in my name, and according to my law and by my word, he will not commit ^dsin, and I will justify him.