Joseph gives a discourse identifying Moroni as the angel who delivered the Book of Mormon.
Joseph Smith, Discourse, circa June 26 and 4 August 1839, transcribed by William Clayton, reproduced by L. John Nuttall, Church History Library, The Joseph Smith Papers website, accessed August 11, 2021
Michael, Adam, Noah— I am Gabriel,— well says I who are you, I am Peter the angel flying through the midst of heaven. Moroni delivered the Book of Mormon.