2 John 1:10-13

So if anyone comes into your fellowship claiming to be a true believer yet doesn’t bring this teaching, you are not to consider him as a fellow believer, nor should you welcome him into your homes. For if you welcome him as a believer, you will be partnering with him in his evil agenda. Although I have many more subjects I’d like to discuss with you, I’d rather not include them in this letter. But I look forward to coming to visit and speaking with you face-to-face —for being together will complete our joy! The children of your sister, whom God has chosen, send you their loving greetings. Amen.