1 John 2:18-19, 22

Children, it is the last hour, and as you have heard that antichrist is coming, so now many antichrists have come. Therefore we know that it is the last hour. They went out from us, but they were not of us; for if they had been of us, they would have continued with us. But they went out, that it might become plain that they all are not of us.

Who is the liar but he who denies that Jesus is the Christ? This is the antichrist, he who denies the Father and the Son.