1 Nephi 11

I found one interesting word that explains much of Nephi's vision as he records -

"...behold this thing shall be given unto thee for a sign, that after thou hast beheld the tree which bore the fruit which thy father tasted, thou shalt also behold a man descending out of heaven, and him shall ye witness; and after ye have witnessed him ye shall bear record that it is the Son of God."  (1 Nephi 11:7)

It is the word "it".   I note that in reference to the Savior, Nephi uses the word "him".  So when he is to bear record of the Tree, Nephi uses the reference to the Tree saying "it is the Son of God".