Jason W. Briggs interviews Emma Hale Smith who denies Joseph taught "polygamy."
Jason W. Briggs, Interview with Emma Hale Smith Bidamon, April 1867, in Joseph Smith III and Heman C. Smith, comp., History of the Church of Jesus Christ of Latter Day Saints, 1844–1872 (Lamoni, IA: Board of Publication of the Reorganized Church of Jesus Christ of Latter Day Saints, 1908), 3:352
"J. W. B. – Did Joseph Smith ever teach you the principles of polygamy, as being revealed to him, or as a correct and righteous principle?"
"Mrs. B. – He never did."