Brigham was baptized in the Church of Mormon

In 1830 a young man named Samuel Smith, Joseph Smith's brother, came to Mendon to introduce about the newly established Church, The Church of Jesus Christ of Latter-day Saints|Church of Christ, or Mormon Church. Smith sent Brigham's brother Phineas a copy of the Book of Mormon, who read it and gave it to John Young, Brigham's father. It was given by John Young to his daughter, who then handed it to Brigham Young.

Although curious, Brigham remained cautious. He continued to read the Bible on his own because he had grown weary of the denominations of his day. He thoroughly examined the Book of Mormon for two years and submitted it to every test he could think of. He also read and studied the Bible.

Early in 1832, a young Mormon missionary gave Brigham Young a testimony of the Book of Mormon. Later, Brigham claimed that this humble testimony burned into his bones and told him the truth. In the spring of 1832, he and his family—including his brothers—were baptized. Although his wife was also baptized, Abigail passed away from tuberculosis a few months later. In the areas near Mendon, Brigham started preaching the restored message of Jesus Christ right away. During these missionary outings, he placed his kids in the hands of fellow convert Heber C. Kimball at Mendon.