Question: what is 3 john about?
Answer: The Third Epistle of John is a private letter composed to a man named Gaius, recommending to him a group of Christians led by Demetrius, which had come to preach the gospel in the area where Gaius lived. ... Robinson, who dates 3 John to c. AD 60–65. The location of writing is unknown, but tradition places it in Ephesus.