1 John 2:18: “Even now there have come to be many antichrists; from which fact we gain the knowledge that it is the last hour.” (By “last hour” John evidently meant the end of the apostolic period. The other apostles had died, and John himself was very old.)

Does the Bible refer to only one antichrist?

1 John 2:18: “Young children, it is the last hour, and, just as you have heard that antichrist is coming, even now there have come to be many antichrists; from which fact we gain the knowledge that it is the last hour.”

2 John 7: “Many deceivers have gone forth into the world, persons not confessing Jesus Christ as coming in the flesh. This is the deceiver and the antichrist.” (Notice that the “many antichrists” of 1 John 2:18 are here referred to collectively as “the antichrist.”)