1 John 2:22

Τίς ἐστιν ὁ ψεύστης, εἰ μὴ ὁ ἀρνούμενος ὅτι Ἰησοῦς οὐκ ἔστιν ὁ Χριστός; Οὗτός ἐστιν ὁ ἀντίχριστος, ὁ ἀρνούμενος τὸν Πατέρα καὶ τὸν υἱόν.

Tis estin o pseystēs, ei mē o arnoymenos oti Iēsoys oyk estin o Christos; Oytos estin o antichristos, o arnoymenos ton Patera kai ton yion.

King James Version (KJV)

Who is a liar but he that denieth that Jesus is the Christ? He is antichrist, that denieth the Father and the Son.

Modern English

Who is the liar? It is whoever denies that Jesus is the Christ. Such a person is the antichrist — denying the Father and the Son.