The Epistles of John, assigned to the writer of the Fourth Gospel and the Revelation, testify that God is love and that love is the test of religion. Second John is written to “the elect lady and her children,” probably a church; Third John is addressed to “the beloved Gaius.”

2 John 1

1:10 If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him God speed: