In 1 Nephi 11:21 mention is made of the "Lamb of God." Critics have claimed that this phrase is strictly New Testament language (compare John 1:20), and that this proves that Joseph Smith was plagiarizing the Bible.
According to Charles Pyle, until critics produce the original writings of all of the prophets of the Old Testament age, and prove, beyond all doubt that such is the case, they cannot make this claim! Besides, this term occurs in the context of a vision that Lehi saw (1 Nephi 10:7-10), in which he hears John the Baptist bear record that he had baptized the Lamb of God. In this vision it is an angel of the Lord that commands Nephi to "Behold the Lamb of God." It is also possible, considering the fact that the small plates of Nephi were made some years after this vision, that the term "Lamb of God" became part of Nephi's vocabulary at this time, and was incorporated into his later description of his father's vision. Equally possible, is that Nephi could have drawn upon the imagery of the lamb brought to the slaughter to made an offering for sin, as found at Isaiah 53:7, 10, which would have been part of the plates of brass. At any rate, God can say the same thing twice, if he so chooses, even if critics of the Book of Mormon don't believe so. [E. Charles Pyle, "Review of 'The Book of Mormon Vs. the Bible (or Common Sense),'" http:\\[www.linkline.com]\personal\dcpyle\reading\bodineco.htm, p. 8]