2 John 4-9

I rejoiced greatly to find some of your children walking in the truth
   just as we were commanded by the Father.
But now, Lady, I ask you,
   not as though I were writing a new commandment
   but the one we have had from the beginning:
   let us love one another.
For this is love, that we walk according to his commandments;
   this is the commandment, as you heard from the beginning,
   in which you should walk.

Many deceivers have gone out into the world,
   those who do not acknowledge Jesus Christ as coming in the flesh;
   such is the deceitful one and the antichrist.
Look to yourselves that you do not lose what we worked for
   but may receive a full recompense.
Anyone who is so “progressive”
   as not to remain in the teaching of the Christ does not have God;
   whoever remains in the teaching has the Father and the Son.