I reveal unto you a new and an everlasting covenant; and if ye abide not that covenant, then are ye damned; for no one can reject this covenant and be permitted to enter into my glory.
Source, in full
Jesus Christ, speaking through Joseph Smith's 12 July 1843 polygamy revelation on plural marriage and His demand that Emma Smith, the first wife, accept all of Joseph Smith's plural wives; Doctrine and Covenants, 132:1–4, 19, 20, 24, 34, 35, 38, 39, 52, 60–66.