“Here Mormon says that one of the major purposes of the coming forth of the Book of Mormon is to testify of the Bible, and he also states that if we honestly accept one of these scriptures, we will accept the other, for the two scriptures testify of each other. This is also the testimony of Brigham Young:
‘No man can say that this book (laying his hands on the Bible) is true … and at the same time say that the Book of Mormon is untrue; … There is not that person on the face of the earth who has had the privilege of learning the Gospel of Jesus Christ from these two books, that can say that one is true, and the other is false. No Latter-day Saint, no man or woman, can say the Book of Mormon is true, and at the same time say that the Bible is untrue. If one be true, both are.’
(Journal of Discourses, 1:38.)”
(Daniel H. Ludlow, A Companion to Your Study of the Book of Mormon, p. 344).