"Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves." (Matthew 7:15)
"And many false prophets shall rise, and shall deceive many." (Matthew 24:11)
"But there were false prophets also among the people, even as there shall be false teachers among you, who privily shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction." (2 Peter 2:1)
"No one shall be appointed to receive commandments and revelations in this church excepting my servant Joseph Smith, Jun., for he receiveth them even as Moses…until I shall appoint…another in his stead" (D&C 28:2, 7).
Latter-day Saints believe that the right to prophesy and to receive revelation for the entire Church and the world is reserved for the current prophet and president of the church.