About June 20, 1829

Fayette, New York
Joseph Smith was present as the Three Witnesses were shown the plates by the angel Moroni. About this same time, Joseph Smith received Doctrine and Covenants 18, a revelation to himself, Oliver Cowdery, and David Whitmer. The mission and calling of the Twelve Apostles were revealed, and Oliver and David were directed to "search out" the Twelve.
Sources: 
History of the Church, Joseph Smith, 1:56, 62-64
Sustaining the Law: Joseph Smith's Legal Encounters Gordon A. Madsen, Jeffrey N. Walker, and John W. Welch, 
Winter Quarters

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