2 John 1:7-11

For many deceivers are gone forth into the world, even they that confess not that Jesus Christ cometh in the flesh. This is the deceiver and the antichrist. Look to yourselves, that ye lose not the things which we have wrought, but that ye receive a full reward. Whosoever goeth onward and abideth not in the teaching of Christ, hath not God: he that abideth in the teaching, the same hath both the Father and the Son. If any one cometh unto you, and bringeth not this teaching, receive him not into your house, and give him no greeting: for he that giveth him greeting partaketh in his evil works.