Verse

2 John 1:8

A church father on this verse
Here John is warning people not to fall away into heresy or to revert back to the Old Testament law once they have received the New.
Hilary of Arles, 5th c. — INTRODUCTORY COMMENTARY ON 2 JOHN
Original

8Look to yourselves, that we lose not those things which we have wrought, but that we receive a full reward.

Modern

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In context

6And this is love, that we walk after his commandments. This is the commandment, That, as ye have heard from the beginning, ye should walk in it.

7For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist.

2 John 1:8

9Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son.

10If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him God speed:

Read all of 2 John 1