The Doctrine and Covenants/Section 2
Words of Moroni to Joseph Smith, Manchester, New York, September 21, 1823. History of the Church 1:12.:
1 Behold, I will reveal unto you the Priesthood, by the hand of Elijah the prophet, before the coming of the great and dreadful day of the Lord.
2 And he shall plant in the hearts of the children the promises made to the fathers, and the hearts of the children shall turn to their fathers.
3 If it were not so, the whole earth would be utterly wasted at his coming.