Joseph Smith’s revelation on marriage declared that the “continuation of the seeds forever and ever” helped to fulfill God’s purposes for His children.This promise was given to all couples who were married by priesthood authority and were faithful to their covenants.
During the third and final appearance, the angel came with a drawn sword, threatening Joseph with destruction unless he went forward and obeyed the commandment fully.
Fragmentary evidence suggests that Joseph Smith acted on the angel’s first command by marrying a plural wife, Fanny Alger, in Kirtland, Ohio, in the mid-1830s.
Joseph knew the practice of plural marriage would stir up public ire.
After receiving the commandment, he taught a few associates about it, but he did not spread this teaching widely in the 1830s.
Ancient principles—such as prophets, priesthood, and temples—would be restored to the earth.