Lightner quotes Joseph saying that an angel commanded him between 1834 and 1842 to practice polygamy; if not, the angel would slay him.
Typescript of remarks by Sister Mary E. Lightner at Brigham Young University, 14 April 1905, 3, 5, MSS 363, Folder 6, Item 6, L. Tom Perry Special Collections, Harold B. Lee Library, Brigham Young University
The angel came to me three times between the years of '34 and '42 and said I was to obey that principle or he would slay me.
. . .
I know he had three children. They told me. I think two are living today but they are not known as his children as they go by other names.