Good point. But I remember from my youth that it was common for people to use that phrase if they were reading from anywhere in an Epistle. Perhaps it is or was understood to mean "Here endeth the Epistle reading." But you're right in that the way it reads, it's as if you've read the actual end of the Epistle.
It's clear enough what's intended, but the phrasing is a bit askew.
Oh, my Bill has just been elected Patrol Leader!