“If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him God speed:”
King James Version (KJV)
1:10 If any came to you - Either as a teacher or a brother. And bring not this doctrine - That is, advance anything contrary to it. Receive him not into your house - As either a teacher or a brother - Neither bid him God speed - Give him no encouragement therein.
2Jo 1:10 If there come any unto you, and bring not this doctrine. That of Christ. If he be a deceiver, an opposer of Christ, one who denies that "Jesus Christ came in the flesh". Receive him not into [your] house. Do not recognize him as a brother and extend to him a brotherly welcome. He is to be fellowshipped. Neither bid him God speed. Give him no encouragement in his work of destruction. To give him greetings is to wish for his success.