Oliver Cowdery is instructed to tell Hiram Page that his seer stone's revelations are not from God.
Joseph Smith, Revelation to Oliver Cowdery, September 1830–B [D&C 28], 41, The Joseph Smith Papers
And again thou shalt take thy Brother Hyram [Hiram Page] Between him & thee alone & tell him that those things which he hath written from that Stone are not of me & that Satan deceiveth him for Behold those things have not been appointed unto him Neither shall any thing be appointed unto any of this Church contrary to the Church Articles & Covenants