If anyone comes to you and does not bring this doctrine, do not receive him into your house nor greet him; — 2 John 1:10, NKJV

2 John 1:10 instructs Christians not to welcome or greet someone who doesn’t bring the teaching of Christ. This is because welcoming or greeting such a person would be a form of support and would make one a partaker in their wicked works. The verse emphasizes the importance of upholding sound doctrine and avoiding false teachings.
Elaboration:
Context:
The passage is part of a letter from the Apostle John to a woman known as “the elect lady” and her children, warning against false teachers who deny that Jesus Christ came in the flesh.
False Doctrine:
The false teachers are described as those who do not confess that Jesus Christ came in the flesh, which is a core belief of Christianity.
Avoidance:
The verse instructs believers to not receive these false teachers into their homes or greet them, as doing so would be a form of approval and would make them complicit in their false teaching.
Importance of Sound Doctrine:
The verse highlights the importance of adhering to the true teaching of Christ and avoiding false doctrines.
Consequences of Support:
Welcoming or greeting a false teacher is likened to sharing in their wicked works, suggesting that it would be a form of participation in their sin.