Liberty, Missouri. After Joseph Smith's failed escape attempt, local citizens gathered outside of Liberty Jail and threatened to kill him and his fellow inmates. Joseph prophesied that they would be kept safe.
[During the escape, six Mormons came to visit, foiling the attempt]
[BYU Studies Journal, volume 46, no. 4: A Chronology of the Life of Joseph Smith, http://byustudies.byu.edu]