THIS MIGHT SURPRISE YOU
The answer
Only in 1 and 2 John. The word appears in 1 John 2:18, 2:22 and 4:3, and in 2 John 7. Revelation's beasts are never called by it. In 1 John, the antichrist is "the one who denies the Father and the Son" (1 John 2:22).
Why it’s interesting
The picture many people carry joins the word from John's letters to the beast of Revelation 13, a link neither book makes. The letters also speak of more than one: "many antichrists have come" (1 John 2:18).
Scholarly consensus
Learn the Bible.
Not just the stories, but the history, authorship, and scholarship behind it.