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

22. Revelation through Joseph Smith, Manchester, New York, April 1830.
History of the Church 1:79-80.

22:1 Behold, I say unto you that all old covenants have I caused to be done away in this thing; and this is a new and an everlasting covenant, even that which was from the beginning.

22:2 Wherefore, although a man should be baptized an hundred times it availeth him nothing, for you cannot enter in at the strait gate by the law of Moses, neither by your dead works.

22:3 For it is because of your dead works that I have caused this last covenant and this church to be built up unto me, even as in days of old.

22:4 Wherefore, enter ye in at the gate, as I have commanded, and seek not to counsel your God. Amen.