Doctrine and Covenants of the Church of Jesus Christ of the Latter-Day Saints, at sacred-texts.com

2. Words of Moroni to Joseph Smith, Manchester, New York, September 21, 1823.
History of the Church 1:12.

2:1 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.

2:2 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.

2:3 If it were not so, the whole earth would be utterly wasted at his coming.