2 John 1:6-8

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. 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. Watch out that you do not lose what you have worked for, but that you may be rewarded fully.
(2 John約翰二書1:6-8)