In the Doctrine and Covenants, Joseph Smith receives revelation teaching that the prepared shall not fear.
Section 38:30, Doctrine and Covenants, The Church of Jesus Christ of Latter-Day Saints, accessed February 23, 2023
30 I tell you these things because of your prayers; wherefore, treasure up wisdom in your bosoms, lest the wickedness of men reveal these things unto you by their wickedness, in a manner which shall speak in your ears with a voice louder than that which shall shake the earth; but if ye are prepared ye shall not fear.