That which we have seen and heard we proclaim also to you: the sequence seen and heard is a reversal of that in verse 1b for the sake of stylistic variety, again, or because, seen best fits the directly preceding “made manifest” (compare the sequence in verse 2ab). Also serves to emphasize the subsequent to you, in contrast with the preceding we: what “we” have experienced is now communicated to “you.”

In translation the clause should echo the structure of verse 1b and the verb occurring in verse 2b as closely as possible. In some cases it is best rendered as a new sentence (compare above on verses 1-3b); in others an introductory phrase is required such as ‘we repeat’ or ‘I am going to say to you again.’

The conjunction so in so that you may have fellowship with us refers to intended result. Rendering the clause as a coordinate sentence, one may say, for example, ‘(and) so you shall have…,’ ‘we want you to have….’ For have fellowship with see the next entry.

And our fellowship is with …. The use of the Greek particles kai and de together is at first view somewhat redundant; but the first may be taken to emphasize our fellowship, thus indicating a shift of focus from what “you” may have to what “we” have already. As for the second, it probably has transitional function, and shows that verse 3c is, in form, a new sentence. In context, however, it is closely connected with verse 3b, of which it is the continuation and further development. Together with verse 3b it serves to express the thought that “you,” through entering the fellowship with the eyewitnesses, will come to participate in the fellowship the latter have with God and Christ. Some versions prefer to bring this out by rendering verse 3bc as one sentence; compare, for example, “so that you will join with us in the fellowship that we have with…” (Good News Translation).

In our fellowship is with, the pronoun should get some emphasis. This may lead to renderings such as ‘the fellowship we have is with’ or ‘we are fellows of.’

† Fellowship (here and verses 6-7), or ‘being fellows/partners/companions,’ refers to “being together,” “doing something together,” and “sharing something.” The term should be understood in the light of such passages as John 15.1-8 and 1 Cor 12.12-31. It refers to the life the believers share with Christ and with one another.

Some of the renderings used have the basic meaning of ‘being friends,’ ‘being one,’ ‘togetherness,’ ‘eating together,’ or ‘eating out of one dish’ (both usable in an expanded meaning), ‘being of the same mind,’ ‘head-hearts becoming one.’ Or they are reciprocal forms of verbs or verbal phrases like ‘to stay contentedly,’ ‘to love,’ ‘to feel.’ Such forms may require some syntactic shifts; for example, ‘we and you love-one-another,’ ‘we (inclusive) are-one-with-each-other’ in verse 3b, or ‘we and God and his Son Jesus Christ feel-with-each-other’ in verse 3c.

With the Father and with his Son Jesus Christ. This construction simply puts the Father and the Son side by side, but it probably means to say that the fellowship with the Father is the ultimate goal (mentioned first, therefore), and that this goal is to be reached through fellowship with the Son (compare 2.23).

† In his Son, often ‘his Child,’ the gender must be inferred from the accompanying masculine forms or from the general context. Translational problems are basically the same as for “the Son of God” (for which see 3.8), but they may be more easily solved in the present verse, because it mentions “the Son” in direct combination with “the Father.” Other occurrences of his Son in the sense of “the Son of God” are 1.7; 3.23; 4.9 (with “only”), 10, 14; 5.9-12, 20; compare also “the Father’s Son” in 2 John 3.

† Jesus Christ: Here, and at the other occurrences of this combination (2.1; 3.23; 4.2; 5.6, 20; 2 John 3, 7), both words should be treated as proper names and accordingly be transliterated. Compare also comments on “Jesus” in 1 John 1.7, and on “Christ” in 2.22.

Quoted with permission from Haas, C., de Jonge, M. and Swellengrebel, J.L. A Handbook on The First Letter of John. (UBS Handbook Series). New York: UBS, 1972. For this and other handbooks for translators see here .