D&C 4

 The first revelation that the Prophet Joseph Smith gave to a person who may have wanted to know the will of the Lord concerning them was to his father.  Before the Church was organized and any callings issued, the Lord declared - 

"Therefore, O ye that embark in the service of God, see that ye serve him with all your heart, might, mind and strength, that ye may stand blameless before God at the last day.

3 Therefore, if ye have desires to serve God ye are called to the work;

4 For behold the field is white already to harvest; and lo, he that thrusteth in his sickle with his might, the same layeth up in store that he perisheth not, but bringeth salvation to his soul;

5 And faith, hope, charity and love, with an eye single to the glory of God, qualify him for the work."  (Doctrine and Covenants 4:2–5)

Many consider this a revelation on missionary work.  But my thoughts this morning went more to the gathering of Israel with an emphasis on both sides of the veil.  Obvisously, temple work as a patron and as a worker should be considered in this work.