B. H. Roberts speaks of the Book of Mormon as a witness for the birth and resurrection of Christ.
B. H. Roberts, “What a Gospel Message is Here!” Deseret News (April 4, 1931): 52–53
When Samuel, the Lamanite prophet, brought his message of the signs of the Christbirth to the Nephites five years before that event, he also said to them that he had received knowledge of the signs that would be given in this western land of the Messiah's death, burial, and resurrection, saying:
[Quotation of Helaman 14:14–27]
In the thirty-fourth year from the time when the beautiful signs of the Christ's birth were given, described at length in the Christmas News of 1930, the fulfillment of the foregoing prophecy, according to the Book of Mormon, took place. I cannot hope to improve upon the description as given by the Book of Mormon writer in III Nephi: hence I quote:
[Quotations of 3 Nephi]
Thus the Easter Event of the western hemisphere was completed, and here it was established by occular and auditory evidence, and the people of the western world could exclaim as well as the people in the eastern world:
Christ is risen! And the answer consistently repeated, He is risen indeed!
God left not himself without witnesses in this western world; for the evidence was repeated from mouth to mouth, from generation to generation and has finally come to us through the American Scripture, the Book of Mormon.