2   And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world.
και αυτος ιλασμος εστιν περι των αμαρτιων ημων ου περι των ημετερων δε μονον αλλα και περι ολου του κοσμου

3   And hereby we do know that we know him, if we keep his commandments.
και εν τουτω γινωσκομεν οτι εγνωκαμεν αυτον εαν τας εντολας αυτου τηρωμεν

4   He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him.
ο λεγων εγνωκα αυτον και τας εντολας αυτου μη τηρων ψευστης εστιν και εν τουτω η αληθεια ουκ εστιν

5   But whoso keepeth his word, in him verily is the love of God perfected: hereby know we that we are in him.
ος αν τηρη αυτου τον λογον αληθως εν τουτω η αγαπη του θεου τετελειωται εν τουτω γινωσκομεν οτι εν αυτω εσμεν

6   He that saith he abideth in him ought himself also so to walk, even as he walked.
ο λεγων εν αυτω μενειν οφειλει καθως εκεινος περιεπατησεν και αυτος ουτως περιπατειν

7   Brethren, I write no new commandment unto you, but an old commandment which ye had from the beginning. The old commandment is the word which ye have heard from the beginning.
αδελφοι ουκ εντολην καινην γραφω υμιν αλλ εντολην παλαιαν ην ειχετε απ αρχης η εντολη η παλαια εστιν ο λογος ον ηκουσατε απ αρχης

8   Again, a new commandment I write unto you, which thing is true in him and in you: because the darkness is past, and the true light now shineth.
παλιν εντολην καινην γραφω υμιν ο εστιν αληθες εν αυτω και εν υμιν οτι η σκοτια παραγεται και το φως το αληθινον ηδη φαινει

9   He that saith he is in the light, and hateth his brother, is in darkness even until now.
ο λεγων εν τω φωτι ειναι και τον αδελφον αυτου μισων εν τη σκοτια εστιν εως αρτι

10   He that loveth his brother abideth in the light, and there is none occasion of stumbling in him.
ο αγαπων τον αδελφον αυτου εν τω φωτι μενει και σκανδαλον εν αυτω ουκ εστιν