Is the celebrated passage 1 John 5:7-8 (KJV) authentic or spurious? This question once raised so much interest that even Sir Isaac Newton (d. 1722) and later the historian Edward Gibbon wrote about it (1784). The librarian T. H. Horne (d. 1862) listed over 50 bibliographic items, each devoted to the disputed verse. This new book expands Horne's list, and fills in gaps. It provides a history of the debate, with details gleaned from primary readings taken from items in this first update of Horne's bibliography in over a century. The author, himself a professional librarian, compiled 137 items (37 journal articles, 50 essays from books, and 50 entire book) each on 1 John 5:7-8. The journal articles alone were published in no less than six different languages. In the late 1800's some boasted that the debate was over, and that the verse was "proved" to be spurious. However, interest in the verse grew. The new list of journal articles attracts the attention of librarians such as La Croze (d. 1739) librarian at Berlin. Others include Le Long (d. 1721) librarian at Paris; Horne (d. 1862) librarian of the British museum; E. Abbot (d. 1884) librarian at Harvard; Harnack (d. 1930) director of the Prussian State Library; and Sir Frederic Kenyon (d. 1952) director of the British museum. Each of these librarians published his views on the verse. W. Orme wrote his memoirs of the debate in 1830, but no one attempted an exhaustive history. Ayuso noted in 1947 that R. Cornely affirmed that one could even write a huge tome relating the history of this disputed verse. But no serious attempt ever appeared until now.