1 Jean 4:2-3

2ἐν τούτῳ γινώσκετε τὸ Πνεῦμα τοῦ Θεοῦ· πᾶν πνεῦμα ὃ ὁμολογεῖ Ἰησοῦν Χριστὸν ἐν σαρκὶ ἐληλυθότα, ἐκ τοῦ Θεοῦ ἐστι·

3καὶ πᾶν πνεῦμα ὃ μὴ ὁμολογεῖ τὸν Ἰησοῦν Χριστὸν ἐν σαρκὶ ἐληλυθότα, ἐκ τοῦ Θεοῦ οὐκ ἔστι· καὶ τοῦτό ἐστι τὸ τοῦ ἀντιχρίστου, ὃ ἀκηκόατε ὅτι ἔρχεται, καὶ νῦν ἐν τῷ κόσμῳ ἐστὶν ἤδη.