Epistle (Quaker)

Quaker epistle: in the 17th century, the Quaker movement revived the Gospel use of the word "epistle" to mean an advisory or admonitory letter, sent to a group of people, sometimes termed a "general epistle". The text of a short epistle, written by Isaac Penington in 1667 is in .

The term is still in use for letters sent by Yearly Meetings in session to all other Yearly Meetings.

...
Wikipedia