1 John 4 3
while every spirit that doesn't accept Jesus, that spirit isn't from God. In fact it is the spirit of the antichrist which you heard was coming, and which is already in the world.
Compare with other 3 random translations
AMP 1 John 4:3and every spirit that does not confess Jesus [acknowledging that He has come in the flesh, but would deny any of the Son’s true nature] is not of God; this is the spirit of the antichrist, which you have heard is coming, and is now already in the world.
EAS 1 John 4:3But if someone does not agree to say that about Jesus, he does not have God's Spirit. That person has a spirit that comes from the enemy of Christ. You have heard that this enemy of Christ would come among us. Now this spirit is already here in the world.
NKJ 1 John 4:3and every spirit that does not confess that Jesus Christ has come in the flesh is not of God. And this is the spirit of the Antichrist, which you have heard was coming, and is now already in the world.