Other than punctuation, the only difference between the Book of Mormon and the KJV texts is the inversion of “I said” (Book of Mormon) and “said I” (KJV). Therefore, only the Book of Mormon text is quoted here.
Isaiah’s volunteering exemplifies the great desire one feels to serve the Lord when under the influence of his Spirit. Peter was determined to follow Christ wherever he went, and told him “I will lay down my life for thy sake” (John 13:36–37). It is true that he later denied that he knew the Savior, as Christ had prophesied; but after the Holy Ghost came upon Peter, he did lay down his life for Christ as the Savior had foretold.
18 Verily, verily, I say unto thee, When thou wast young, thou girdedst thyself, and walkedst whither thou wouldest: but when thou shalt be old, thou shalt stretch forth thy hands, and another shall gird thee, and carry thee whither thou wouldest not.
19 This spake he, signifying by what death he should glorify God. And when he had spoken this, he saith unto him, Follow me. [John 21:18–19]