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.”

1 John 3

3:16 Hereby perceive we the love of God, because he laid down his life for us: and we ought to lay down our lives for the brethren.