Parallel
1 John 4:3
World English Bible British Edition · Berean Standard Bible
and every spirit who doesn’t confess that Jesus Christ has come in the flesh is not of God; and this is the spirit of the Antichrist, of whom you have heard that it comes. Now it is in the world already.
and every spirit that does not confess Jesus (note: BYZ and TR that Jesus Christ has come in the flesh) is not from God. This is the spirit of the antichrist, which you have heard is coming and which is already in the world at this time.