The Third  Epistle of John, often referred to as Third John, was written by John the Evangelist (who refers to himself as John the Elder).  The Third  Epistle of John is a private letter written to a man named Galius emphasizing the importance of hospitality.  The Third  Epistle of John is the shortest book in the Bible by word count (Second John however, has few verses) and was probably written around 90 AD when John was exiled on the island of Patmos.