The author reminds the readers about the command to love one another.
He also warns them not to receive into their community those who deny that Jesus Christ came in the flesh.
The Book of 2 John is an urgent plea that the readers of John’s letter should show their love for God and His son Jesus by obeying the commandment to love each other and live their lives in obedience to the Scriptures.
The Book of 2 John is also a strong warning to be on the lookout for deceivers who were going about saying that Christ had not actually risen in the flesh but only spiritually. He told the church members not to accept these false teachers into their homes. They must separate themselves from everyone who denied Jesus’ physical life on earth.
4 It has given me great joy to find some of your children walking in the truth, just as the Father commanded us. 5 And now, dear lady, I am not writing you a new command but one we have had from the beginning. I ask that we love one another. 6 And this is love: that we walk in obedience to his commands. As you have heard from the beginning, his command is that you walk in love.
7 I say this because many deceivers, who do not acknowledge Jesus Christ as coming in the flesh, have gone out into the world. Any such person is the deceiver and the antichrist. 8 Watch out that you do not lose what we have worked for, but that you may be rewarded fully. 9 Anyone who runs ahead and does not continue in the teaching of Christ does not have God; whoever continues in the teaching has both the Father and the Son. 10 If anyone comes to you and does not bring this teaching, do not take them into your house or welcome them. 11 Anyone who welcomes them shares in their wicked work.