Beware of Antichrists

1 John 2:21

In 9 translations

BSB: I have not written to you because you lack knowledge of the truth, but because you have it, and because no lie comes from the truth.
KJV: I have not written unto you because ye know not the truth, but because ye know it, and that no lie is of the truth.
WEB: I have not written to you because you don’t know the truth, but because you know it, and because no lie is of the truth.
ASV: I have not written unto you because ye know not the truth, but because ye know it, and because no lie is of the truth.
LSV: I did not write to you because you have not known the truth, but because you have known it, and because no lie is of the truth.
YLT: 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.
DBY: I have not written to you because ye do not know the truth, but because ye know it, and that no lie is of the truth.
DRC: I have not written to you as to them that know not the truth, but as to them that know it: and that no lie is of the truth.
GNV: I haue not written vnto you, because ye knowe not the trueth: but because ye knowe it, and that no lie is of the trueth.

SBLGNT: οὐκ ἔγραψα ὑμῖν ὅτι οὐκ οἴδατε τὴν ἀλήθειαν, ἀλλʼ ὅτι οἴδατε αὐτήν, καὶ ὅτι πᾶν ψεῦδος ἐκ τῆς ἀληθείας οὐκ ἔστιν.
RP2018: Οὐκ ἔγραψα ὑμῖν ὅτι οὐκ οἴδατε τὴν ἀλήθειαν, ἀλλ’ ὅτι οἴδατε αὐτήν, καὶ ὅτι πᾶν ψεῦδος ἐκ τῆς ἀληθείας οὐκ ἔστιν.
TR-Boyd: Οὐκ ἔγραψα ὑμῖν ὅτι οὐκ οἴδατε τὴν ἀλήθειαν, ἀλλ᾿ ὅτι οἴδατε αὐτήν, καὶ ὅτι πᾶν ψεῦδος ἐκ τῆς ἀληθείας οὐκ ἔστι.
SCR1894: ουκ εγραψα υμιν οτι ουκ οιδατε την αληθειαν αλλ οτι οιδατε αυτην και οτι παν ψευδος εκ της αληθειας ουκ εστιν

From public-domain Bible dictionaries and topical indexes (1884–1915).

2 Peter 1:12Therefore I will always remind you of these things, even though you know them and are established in the truth you now have.
Jude 1:5Although you are fully aware of this, I want to remind you that after Jesus had delivered His people out of the land of Egypt, He destroyed those who did not believe.
Proverbs 1:5let the wise listen and gain instruction, and the discerning acquire wise counsel
Romans 15:14–15I myself am convinced, my brothers, that you yourselves are full of goodness, brimming with knowledge, and able to instruct one another. However, I have written you a bold reminder on some points, because of the grace…
Proverbs 9:8–9Do not rebuke a mocker, or he will hate you; rebuke a wise man, and he will love you. Instruct a wise man, and he will be wiser still; teach a righteous man, and he will increase his learning.

From the OpenBible.info cross-reference set (votes from readers; not every link is a quotation or allusion).