2 John 1:1; 2 John 1:5; 2 John 1:9-10; 2 John 1:12

2 John 1:1

1 The elder unto the elect lady and her children, whom I love in the truth; and not I only, but also all they that have known the truth;

2 John 1:5

5 And now I beseech thee, lady, not as though I wrote a new commandment unto thee, but that which we had from the beginning, that we love one another.

2 John 1:9-10

9 Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son.

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

2 John 1:12

12 Having many things to write unto you, I would not write with paper and ink: but I trust to come unto you, and speak face to face, that our joy may be full.