The scriptural foundation of home teaching is the commandment for priesthood holders to "watch over the church always, and be with and strengthen them" (D&C 20:53; see also D&C 20:54–55; Moroni 6:4). Through home teaching, priesthood holders join with the Lord in watching over and strengthening Church members. From the time priesthood holders are ordained to the office of teacher, they have the opportunity and responsibility to serve as home teachers. Accordingly, home teachers are assigned by priesthood leaders. They are not called, sustained, or set apart.