1 John in the early church

Every passage that quotes, alludes to, or echoes 1 John, in verse order; passages on the same verse are in date order. References use the Protestant English Bible's numbering, with a writer's own numbering in brackets where it differs.

Verse	Passage	Kind	Date
1 John 1:1	To Polycarp 3.2 · Ignatius of Antioch	echo, low confidence	ca. 110 (range ca. 105–135)
1 John 2:17	Didache 10.6 · Anonymous	echo, low confidence	ca. 50–150 (often ca. 100)
1 John 2:18	To the Ephesians 11.1 · Ignatius of Antioch	allusion, medium confidence	ca. 110 (range ca. 105–135)
1 John 3:6	To the Ephesians 14.2 · Ignatius of Antioch	echo, low confidence	ca. 110 (range ca. 105–135)
1 John 3:8	To the Philippians 7.1 · Polycarp of Smyrna	quotation, high confidence	ca. 110–135
1 John 4:2	To the Smyrnaeans 5.2 · Ignatius of Antioch	echo, medium confidence	ca. 110 (range ca. 105–135)
1 John 4:2–3	To the Philippians 7.1 · Polycarp of Smyrna	quotation, high confidence	ca. 110–135