Teacher, Aaronic Priesthood See also Aaronic Priesthood An office in the Aaronic Priesthood. The teacher’s duty is to watch over the Church, D&C 20:53–60. The office of teacher is a necessary appendage to the lesser priesthood, D&C 84:30, 111. The president of a teachers quorum presides over twenty-four teachers, D&C 107:86.