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It is the gospel of John (also called the book of John) and the three epistles of John. Four books in the whole:
John wrote the first chapter of his gospel and also of his epistle because he was directed to by God. (Peter1.21)
3 John
John Dodge has written:
'The first epistle of John' -- subject(s): Controversial literature, Christianity, Christianity and religious humanism, Deism
John Cave has written:
'An epistle to the inhabitants of Gillingham'