30 Wherefore, my brethren, I would that ye should consider that the things which have been written upon the plates of brass are true; and they testify that a man must be obedient to the commandments of God.
31 Wherefore, ye need not suppose that I and my father are the only ones that have testified, and also taught them. Wherefore, if ye shall be obedient to the commandments, and endure to the end, ye shall be saved at the last day. And thus it is. Amen.
(1 Nephi 22:30-31)
After quoting two chapters of Isaiah and elaborating on the words of multiple prophets, Nephi ends his first book by pleading with his brothers to take seriously the words in the scriptures. Since they have accused him of being “like unto our father, led away by the foolish imaginations of his heart” (1 Nephi 17:20), Nephi makes a point of demonstrating to them that he and his father are not the only ones who have taught these things, that these truths have been taught by prophets throughout the ages.
The value of multiple witnesses is a recurring theme in Nephi’s writings. During his vision, the angel explained to him that modern scriptures, including the Book of Mormon would bolster the credibility of the Bible:
And the angel spake unto me, saying: These last records, which thou hast seen among the Gentiles, shall establish the truth of the first, which are of the twelve apostles of the Lamb, and shall make known the plain and precious things which have been taken away from them; and shall make known to all kindreds, tongues, and people, that the Lamb of God is the Son of the Eternal Father, and the Savior of the world; and that all men must come unto him, or they cannot be saved.
And they must come according to the words which shall be established by the mouth of the Lamb; and the words of the Lamb shall be made known in the records of thy seed, as well as in the records of the twelve apostles of the Lamb; wherefore they both shall be established in one; for there is one God and one Shepherd over all the earth (1 Nephi 13:40-41).
And after quoting the words of his brother, Jacob, and before quoting a number of chapters from the prophet Isaiah, Nephi explains that he believes the three testimonies together to be stronger than his testimony alone:
And now I, Nephi, write more of the words of Isaiah, for my soul delighteth in his words. For I will liken his words unto my people, and I will send them forth unto all my children, for he verily saw my Redeemer, even as I have seen him.
And my brother, Jacob, also has seen him as I have seen him; wherefore, I will send their words forth unto my children to prove unto them that my words are true. Wherefore, by the words of three, God hath said, I will establish my word. Nevertheless, God sendeth more witnesses, and he proveth all his words (2 Nephi 11:2-3).
Today, I will be grateful for the many witnesses I have received of the gospel, including the testimonies of prophets found in the scriptures. I am grateful for the personal testimonies I have heard from family members and church leaders over the years, and I am also grateful to know that they are not the only ones to have taught these things. God has revealed the fundamental truths of the gospel to prophets throughout the ages, and their combined testimony is a powerful witness of the truth of the gospel.