The Smith family moved to Palmyra in 1816, and in 1824, Harris employed
Joseph Smith Sr., to dig a
well and a
cistern. During this period, Harris had identified himself as an "un-churched
Christian". Smith Sr. reportedly told Harris about the gold plates in 1824.
Role in Anthon transcript Because Harris wanted assurance of the Book of Mormon's authenticity, Smith transcribed characters from the
golden plates to a piece of paper, perhaps the one now known as the
Anthon transcript, but there is much to cast doubt on this document being the original as both Harris's and Anthon's accounts describe it differently. In the winter of 1828, Harris took the transcript of characters to
New York City, where he met with
Charles Anthon, a professor of linguistics at
Columbia College. The two men's accounts of the meeting conflict on almost every point. Harris's account is recorded in Smith's
History of the Church. According to the account, Harris said that Anthon gave him a certificate verifying the authenticity of the characters and the translations, but that when Anthon learned that Smith claimed to have received the plates from an angel, he took the certificate back and tore it to pieces. Anthon, for his part, gave written accounts in 1834 and 1841. Despite the years in between, both accounts are in good agreement, but there is a contradiction as to whether he had given Harris a written opinion about the transcript or not. In both accounts, Anthon maintained that he told Harris that he (Harris) was a victim of a
fraud and not to get involved. In either case, the episode apparently satisfied Harris's doubts about the authenticity of the
golden plates and the translation enough to
mortgage his farm to have the book printed. Harris's wife continued to oppose his collaboration with Smith. In both of Anthon's accounts, he states that Harris visited him again after the Book of Mormon was printed and brought him a copy, which Anthon refused to accept. Anthon records that he again advised Harris he had been defrauded and should go straight home and ask to examine the plates locked in the chest, but Harris responded that he could not look at the plates or he and his family would be cursed.
Scribe to Joseph Smith In February 1828, Harris traveled to
Harmony, Pennsylvania to serve as a scribe while Smith dictated the translation of the golden plates. By June 1828, Smith and Harris's work on the translation had resulted in
116 pages of
manuscript. Harris asked Smith for permission to take the 116 pages of manuscript back to his wife to convince her of its authenticity; Smith reluctantly agreed. After Harris had shown the pages to his wife and some others, the manuscript disappeared while he was serving jury duty. The loss temporarily halted the translation of the plates, and when Smith began again, he used other scribes, primarily
Oliver Cowdery. The first extant written revelation to Joseph Smith, dated July 1828, refers to Smith's delivering the 116 pages to Harris. Addressing Smith, the revelation says: "thou deliveredst up that which was sacred, into the hands of a wicked man, who has set at nought the counsels of God, and has broken the most sacred promises, which were made before God, and has depended upon his own judgement, and boasted in his own wisdom."
Book of Mormon financier Nevertheless, Harris continued to support Smith financially. The translation was completed in June 1829. By August, Smith contracted with publisher
E. B. Grandin of Palmyra to print the
Book of Mormon. Harris mortgaged his farm to Grandin to ensure payment of the printing costs, and he later sold of his farm to pay off the mortgage. Harris gave Grandin's printing office $3,000 () for the Book of Mormon to be published and available for purchase shortly thereafter.
Witness to the golden plates As the translation neared completion, Joseph Smith said he received a revelation from
God that three men would be called as special witnesses to the existence of the golden plates. Harris, along with Oliver Cowdery and
David Whitmer, was chosen as one of the Three Witnesses. In the words of David Whitmer, one of the other two witnesses, "It was in the latter part of June, 1829... Joseph, Oliver Cowdery and myself were together, and the angel showed them [the plates] to us.... [We were] sitting on a log when we were overshadowed by a light more glorious than that of the sun. In the midst of this light, but a few feet from us, appeared a table upon which were many golden plates, also the sword of Laban and the directors. I saw them as plain as I see you now, and distinctly heard the voice of the Lord declaring that the records of the plates of the Book of Mormon were translated by the gift and power of God." Joseph Smith and Martin Harris had a similar experience, and as the manuscript was prepared for printing, Cowdery, Whitmer, and Harris signed a joint statement that has been included in each of the more than 120 million copies of the Book of Mormon printed since then. It reads in part: "And we declare with words of soberness, that an angel of God came down from heaven, and he brought and laid before our eyes, that we beheld and saw the plates, and the engravings thereon; and we know that it is by the grace of God the Father, and our Lord Jesus Christ, that we beheld and bear record that these things are true." In 1839, Smith indicated that Harris's experience in seeing the plates occurred separately from that of Whitmer and Cowdery. The Three Witnesses's attestation was printed with the book, and it has been included in nearly every subsequent edition.
Marital conflict In part because of their continued disagreement over the legitimacy of Smith and the golden plates, and because of the loss of his farm, Harris and his wife separated.
Lucy Harris was described by
Lucy Mack Smith as having an "irascible temper." Lucy Harris wrote that Martin Harris had beaten her "at different times." ==High Priest==