D&C 28
This explains the Gift of Aaron mentioned in section 10. Oliver has the gift to expound to the church, but he is not to direct the church, only to articulate what has been received through Joseph. In other words, Oliver may receive revelations, but not commandments for the church.
I love the way that the Lord explicitly directs that the Hiram Page matter (with the false revelations from the seer stone) should be handled privately.