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 ^cAaron.

  30  And again, the offices of teacher 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 Aaron, by mine own voice, and by the voice of him that sent me, and I have endowed him with the keys 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 sin, and I will justify him.