Post-70 CE

3 John: fifteen verses of church politics, a named opponent who refuses hospitality, and the rare value of a text with nothing doctrinal to say.

2 John: a very short letter about who may be received, the anonymous elder who wrote it, and what it shows about how early congregations policed their networks.

1 John: a community that has divided, a text with no named author, and the Comma Johanneum — a textual addition whose history can be traced document by document.