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15 And it came to pass that Nephi—having been visited by angels and also the voice of the Lord, therefore having seen angels, and being eye-witness, and having had power given unto him that he might know concerning the ministry of Christ, and also being eye-witness to their quick return from righteousness unto their wickedness and abominations;

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You searched for book of mormon witness in Book of Mormon.

The Book of Mormon is a volume of holy scripture comparable to the Bible. Their written testimonies are included herewith as “The Testimony of Three Witnesses” and “The Testimony of Eight Witnesses.” We invite all men everywhere to read the Book of Mormon, to ponder in their hearts the message it contains, and then to ask God, the Eternal Father, in the name of Christ if the book is true.

http://scriptures.lds.org