D&C 126

As a true apostle of the Lord and after years of faithful international missionary service, the Lord instructs - 

"Dear and well-beloved brother, Brigham Young, verily thus saith the Lord unto you: My servant Brigham, it is no more required at your hand to leave your family as in times past, for your offering is acceptable to me.

2 I have seen your labor and toil in journeyings for my name.

3 I therefore command you to send my word abroad, and take especial care of your family from this time, henceforth and forever. Amen."  (Doctrine and Covenants 126:1–3)

This left Brigham Young two to three years of intimate time of training with the Prophet Joseph Smith before the Prophet's death.  It was during this period that the Lord revealed much concerning His eternal ordinances and covenants.