The Book of Mormon Another Testament and Witness with the Bible that Jesus is the Christ
"...Know ye not that the testimony of two nations is a witness unto you that I am God, that I remember one nation like unto another? Wherefore, I speak the same words unto one nation like unto another. And when the two nations shall run together the testimony of the two nations shall run together also." (2 Nephi 29:8)
Below is a short list of some of the fundamental doctrines taught in the Bible for which the Book of Mormon adds additional support and understanding to the Bible scriptures. Giving us another witness of the truthfulness of the doctrines taught in the Bible.
The Book of Mormon: A Witness With The Bible
(Ensign October 2011, p.24-27)
"...in the mouth of two or three witnesses shall every word be established." (2 Corinthians 13:1)