3 John
3 John is a personal letter from John to Gaius. It is in the New Testament of the Bible.
John was glad to hear that Gaius taught the true Christian message. John was also glad that Gaius looked after other Christians. These Christians were travelling to teach God's message elsewhere. And Gaius helped them.
There were some problems in Gaius's church. John wanted to come so that he could help Gaius.