And every spirit that dissolveth Jesus, is not of God: and this is Antichrist, of whom you have heard that he cometh, and he is now already in the world. ~ 1 John 4:3
Haydock Douay Rheims Bible commentary:
Ver. 3. That dissolveth Jesus, viz. either by denying his humanity or his divinity. (Challoner) --- This is antichrist;[2] i.e. such is the spirit of antichrist, of whom you have heard that he cometh, or is to come in the latter times. --- And he is now already in the world, not the chief and great antichrist, but his precursors, in whom he may be said to come. (Witham) --- And he is now already in the world. Not in his person, but in his spirit and in his precursors. (Challoner)