John 20:31 in the King James Version
But these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name.
Context
30 Therefore Jesus did many other signs in the presence of his disciples, which are not written in this book;
31 but these are written that you may believe that Jesus is the Christ, the Son of God, and that believing you may have life in his name.