A commandment I give unto mine handmaid, Emma Smith, your wife, whom I have given unto you ... receive all those that have been given unto my servant Joseph, and who are virtuous and pure before me; and those who are not pure, and have said they were pure, shall be destroyed, 132:51

Trivia: According to the three grand keys that are provided in Section 129, how can you tell if a messenger from God is an angel, the spirit of a just man made perfect, or the devil?