The Church of Jesus Christ of Latter-day Saints has a law of marriage.
Polygamy , or plural marriage , in the Church of Jesus Christ of Latter Day Saints probably originated with the founder of Mormonism , Joseph Smith , who taught that polygamy was a divine commandment . The Church of Jesus Christ of Latter-day Saints . In addition , the church teaches sacred ordinances through which adherents make covenants with God , including baptism , confirmation , the sacrament ( holy communion ) , endowment , and celestial marriage ( marriage blessings which extend beyond mortality ) -- all of which are of great significance to church members .