2 John 1:10-12
1:10 If anyone comes to you and does not bring this teaching, do not receive him into your house and do not give him any greeting,
1:11 because the person who gives him a greeting shares in his evil deeds.
Conclusion
1:12 Though I have many other things to write to you, I do not want to do so with paper and ink, but I hope to come visit you and speak face to face, so that our joy may be complete.