2 John 1:7-11 (New International Version)

 ⁷Many 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. ⁸Watch out that you do not lose what you have worked for, but that you may be rewarded fully. ⁹Anyone 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. ¹⁰If anyone comes to you and does not bring this teaching, do not take him into your house or welcome him. ¹¹Anyone who welcomes him shares in his wicked work.