'Anti christ' in the Bible

Little children, it is the last time: and as you have heard that antichrist shall come, even now are there many antichrists; by which we know that it is the last time.

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

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, of which you have heard that it should come; and even now already is it in the world.