John A. Clark reports Martin Harris's account of Moroni's visit.
Martin Harris, in John A. Clark, The Episcopal Recorder [Philadelphia] 18 (12 September 1840): 98-99; in John A. Clark, Gleanings By the Way (Philadelphia: W. J. &J. K. Simon, 1842), 225-226
According to Martin Harris, it was after one of these night excursions, that Jo, while he lay upon his bed, had a remarkable dream. An angel of God seemed to approach him, clad in celestial splendour. This divine messenger assured him, that he, Joseph Smith, was chosen of the Lord to be a prophet of the Most High God, and to bring to light hidden things, that would prove of unspeakable benefit to the world. He then disclosed to him the existence of this golden Bible, and the place where it was deposited--but at the same time told him that he must follow implicitly the divine direction, or he would draw down upon him the wrath of heaven.