I think you have in mind 1Jn2:22.
“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.”
1Jn2:18-22 is the only place in the entire Bible the word antichrist comes up.
Now, in context, it is being used to refer to people who were part of the Christian community, but denied in some way that Jesus is the Messiah (so, Muslims actually *wouldn’t/I] fall under this category for two reasons: they accept that Jesus is the Christ, and they don’t pretend to be in the Christian community).
But, yes, even in this section, (as in the epistles of Saint Paul and in Revelations and maybe Matthew) there is an implication that at some point there will be a false messiah who will be more historically significant and who will live during the Eschaton.
A sort of, THE antichrist, after a history of lesser antichrists, as Wesrock put it.*