To Break This Covenant One Needs Only to Do Nothing

Melchizedek Priesthood holders and those who have received their temple endowments have made further and specific pledges to do, to work righteousness. The Lord has expressed the mutual pledges between our Heavenly Father and the priesthood holders as an “oath and covenant.” [D&C 84:39.] … One breaks the priesthood covenant by transgressing commandments—but also by leaving undone his duties. Accordingly, to break this covenant one needs only to do nothing. 

Teachings of Presidents of the Church: Spencer W. Kimball, (2006), 124–34