What principle was unique about the original teachings of the Mormons?

Name: What principle was unique about the original teachings of the Mormons?
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The original teachings of the Mormons, as introduced by their founder Joseph Smith and later practiced more openly by Brigham Young and others, included the principle of plural marriages or polygamy. This was a distinctive and controversial aspect of early Mormon doctrine, setting it apart from mainstream Christian denominations of the time.

What Principle Was Unique About the Original Teachings of the Mormons