The subject was not new among the Christians when John wrote his letters (c. 98 C.E.). First John 2:18 states: “Young children, it is the last hour, and, just as you have heard that antichrist [Gr., an·tiʹkhri·stos] is coming, even now there have come to be many antichrists; from which fact we gain the knowledge that it is the last hour.” John’s statement shows that there are many individual antichrists, though all together they may form a composite person designated “the antichrist.” (2Jo 7) The use of the expression “hour” as referring to a period of time, either relatively brief or of undetermined length, is exemplified in other writings of John. (See Joh 2:4; 4:21-23; 5:25, 28; 7:30; 8:20; 12:23, 27.) He thus did not restrict the appearance, existence, and activity of such antichrist to some future time only but showed that the antichrist was then present and would continue on.​—1Jo 4:3.

John specifically mentions apostates as among those of the antichrist by referring to those who “went out from us,” abandoning the Christian congregation. (1Jo 2:18, 19) It therefore includes “the man of lawlessness” or “son of destruction” described by Paul, as well as the “false teachers” Peter denounces for forming destructive sects and who “disown even the owner that bought them.”​—2Th 2:3-5; 2Pe 2:1; see MAN OF LAWLESSNESS.