ISB ~ 2 John 1 v7

many deceivers:Heretical teachers who denied that God the Son came in the flesh as a man. In doing so, they exchanged the truth of the gospel for lies and became “false prophets” who streamed out “into the world” with their errors (1 Jn 4:1) (CCC 465). Behind this warning is John’s concern that these troublemakers might destroy the faith of others, as well (1 Jn 2:26). See note on 1 Jn 4:2.

the antichrist:A title given to anyone who denies the Father and the Son and attacks the messianic claims of Jesus (1 Jn 2:22; CCC 675). See note on 1 Jn 2:18.