The Evening and the Morning Star, Vol. II, No. 14, pg. 105; “The only way of ascertaining a true prophet, is to compare his prophecies with the ancient word of God, and see if they agree, and if they do and come to pass, then certainly he is a true prophet: For it is not possible that the Lord will suffer FALSE prophets, to bring forth the truth, moved upon by the Holy Ghost, for it is written that the Holy Ghost dwelleth not in unholy temples. By their fruits shall they be known. When, therefore any man, no matter who, or how high his standing may be, utters, or publishes, any thing that afterwards proves to be untrue, he is a false prophet.”
Deut. 18:20-22; “But the prophet, which shall presume to speak a word in my name, which I have not commanded him to speak, or that shall speak in the name of other gods, even that prophet shall die. 21 And if thou say in thine heart, How shall we know the word which the LORD hath not spoken? 22 When a prophet speaketh in the name of the LORD, if the thing follow not, nor come to pass, that is the thing which the LORD hath not spoken, but the prophet hath spoken it presumptuously: thou shalt not be afraid of him.”
Published from June 1832 to September 1834 the Evening and Morning Star was the first periodical published by LDS Church so the statements used in this Church sanctioned reading material are noteworthy. Notice how it states so boldly that no matter how high any man’s standing may be if anything he publishes or says is untrue then he is a false prophet.
It’s too bad they didn’t hold this standard to Smith. Here are just a few of Smith’s false prophecies. http://lifeafterministry.wordpress.com/category/joseph-smith-prophecies/