John the Apostle
1 John 4:3BSB·traditional attribution

and every spirit that does not confess Jesus 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.

John Calvin Reformed

3. And this is that spirit of Antichrist The Apostle added this, to render more detestable the impostures which lead us away from Christ. We have already said that the doctrine respecting the kingdom of Antichrist was well known; so that the faithful had been warned as to the future scattering of the Church, in order that they might exercise vigilance.

Jamieson-Fausset-Brown Reformed

confesseth not that Jesus Christ is come in the flesh--IRENÆUS [3.8], LUCIFER, ORIGEN, on Mat 25:14, and Vulgate read, "Every spirit which destroys (sets aside, or does away with) Jesus (Christ)." CYPRIAN and POLYCARP support English Version text. The oldest extant manuscripts, which are, however, centuries after POLYCARP, read, "Every spirit that confesseth not (that is, refuses to confess) Jesus" (in His person, and all...

John Gill Reformed Baptist

And every spirit that confesseth not,.... The proper deity and sonship of Christ, his true and real humanity, and his Messiahship; or any of his offices, doctrines, and ordinances; or his satisfaction and righteousness; or that peace, pardon, justification, life, and salvation, are by him; all which are meant by what follows, that Jesus Christ is come in the flesh: this clause is left out...