THE DECEPTIONS OF THE LAST HOUR
Another reason John gives for writing this letter was that of end-time deceptions. He wanted his readers to be aware of false teachers who would be marked by the characteristics of antichrist.
[18] Having mentioned in v.17 that the world ‘passeth away’ John begins to think about the End.
‘last hour’ (éschatos hṓra) Some tend to overthink this expression and assign it to the long time period between Christ’s Ascension and Second Coming (others might say something similar, like: ‘between Pentecost and the Rapture’). How would the first readers/hearers of this letter have understood these words? They, like John, would have assumed that the eschatological climax of the ages was imminent.
What caused John to think that the End was near? He himself answers that question: ‘now there are many antichrists; whereby we know that it is the ‘last time.’
The word ‘antichrist’ (antíchristos) meaning ‘against Christ’ occurs only in the epistles of John (1 John 2:18, 22; 4:3; 2 John 1:7). The appearance of false teachers and false Christs had been predicted by Jesus himself in Mt 24:4-5, 24-25.
[19] ‘They went out from us’ Note: ‘They’ and ‘us’. The false teachers had defected from the fellowship of the apostles. As regards doctrine, there had been a rift between them and the apostles. ‘Us’ is most likely an apostolic first person plural pronoun (see also 1:1; 4:6). It is likely that as the false teachers travelled around they claimed an association with the apostles. John emphasizes that no such link existed. For John, the fact that these people had left the true faith showed what they were really like.
[20] ‘but ye’ The ‘you’ of vv. 21-22 contrasts with the ‘they’ of v. 19. John’s readers were faithful because they had ‘received an unction (chrísma) from the Holy One’. This may be an allusion to the anointing of the Levitical priests (Ex 40:15). If so, the main idea is that when a priest was anointed it was with the presumption that his ministry for God would continue for the remainder of his life. The ‘unction’ that John’s readers had received is mentioned again twice in v. 27, where it is clear that the reference is to a person.
‘The Holy One’ This is Jesus Christ (see Mk 1:24; Lk 4:34; Jn 6:69; Acts 3:14; Rev 3:7).
As a result of the unction they ‘know (understand) all things.’ (For use of the word ‘know’ (eídō) in 1 John see also: 2:11, 21 (2x), 29; 3:2, 5, 14, 15; 5:13, 15 (2x), 18, 19, 20)
[21] John tactfully tells them that he has written to them precisely because they know the truth (Jer 31:34; Jn 6:45), that because of the unction they already have a good grasp of truth i.e. about Jesus Christ. They will not be caught out by the lies that false teachers were spreading about the Person of Christ.
[22-23] The false teachers were liars because they denied that Jesus was the Messiah, i.e the One sent by God to be the Saviour (Jn 4: 29, 42; 20:31). Having defined the lie John then labels those who propagate that lie as antichrists. To deny the Son is tantamount to denying the Father who sent him (4:10) and who bore witness to him (5:9-10).
Written Exposition 