>>997 (OP)
Doctrine and Covenants 1:37-38
>“37 Search these commandments, for they are true and faithful, and the prophecies and promises which are in them shall all be fulfilled.
>38 What I the Lord have spoken, I have spoken, and I excuse not myself; and though the heavens and the earth pass away, my word shall not pass away, but shall all be fulfilled, whether by mine own voice or by the voice of my servants, it is the same.
>39 For behold, and lo, the Lord is God, and the Spirit beareth record, and the record is true, and the truth abideth forever and ever. Amen.”
Joseph Smith agrees that God’s prophecies (spoken by him or through his prophets) cannot fail
Doctrine and Covenants 114
Revelation given through Joseph Smith the Prophet, at Far West, Missouri, April 11, 1838…
>“1 Verily thus saith the Lord: It is wisdom in my servant David W. Patten, that he settle up all his business as soon as he possibly can, and make a disposition of his merchandise, that he may perform a mission unto me next spring, in company with others, even twelve including himself, to testify of my name and bear glad tidings unto all the world.”
The next spring, David Patten was to start a mission, was Smith’s (false) prophecy fulfilled?
Of course not, David Patten died in October of 1838 before any mission was started.
Joseph Smith, “History of the Church”, Volume 3, P.163
https://archive.org/details/history-of-the-church-volume-3/page/163/mode/1up
>“Brother Patten was buried this day…”
Joseph Smith was a false prophet buried by his own prophecies.