1 John 2:22,23
Who is a liar but he that denies that Jesus is the Christ? He is antichrist, that denies the Father and the Son.
Torrey's Topical Textbook—AKJV

1 John 4:3
And every spirit that confesses not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof you have heard that it should come; and even now already is it in the world.
Torrey's Topical Textbook—AKJV