In Context

18 Little youths, it is the last hour; and even as ye heard that the antichrist doth come, even now antichrists have become many — whence we know that it is the last hour;

19 out of us they went forth, but they were not of us, for if they had been of us, they would have remained with us; but — that they might be manifested that they are not all of us.

20 And ye have an anointing from the Holy One, and have known all things;

21 I did not write to you because ye have not known the truth, but because ye have known it, and because no lie is of the truth.

22 Who is the liar, except he who is denying that Jesus is the Christ? this one is the antichrist who is denying the Father and the Son;

23 every one who is denying the Son, neither hath he the Father, he who is confessing the Son hath the Father also.

1 John 2:21 in Other Translations