1 John 2:22

22Whoτίςisἐστινtheὁliarψεύστηςifεἰnotμὴthe [one]ὁdenyingἀρνούμενοςthatὅτιJesusἸησοῦςnotοὐκisἔστινtheὁChristχριστός;Thisοὗτόςisἐστινtheὁantichristἀντίχριστος,the [one]ὁdenyingἀρνούμενοςtheτὸνFatherπατέραandκαὶtheτὸνSonυἱόν.

Who is the liar, except the one denying that Jesus is the Christ? This is the antichrist, the one denying the Father and the Son.