1 John 4:2-3

Amplified Bible, Classic Edition

² By this you may know (perceive and recognize) the Spirit of God: every spirit which acknowledges and confesses [the fact] that Jesus Christ (the Messiah) [actually] has become man and has come in the flesh is of God [has God for its source];

³ And every spirit which does not acknowledge and confess that Jesus Christ has come in the flesh [but would ^[a]annul, destroy, ^[b]sever, disunite Him] is not of God [does not proceed from Him]. This [^[c]nonconfession] is the [spirit] of the antichrist, [of] which you heard that it was coming, and now it is already in the world.