Some Early Church “Heresy Hunters” Used to Require Meat-eating on Sundays as a Way to Discover Who the Veg Gnostics Were in Their Midst!
Since Gnostics were generally vegetarians, anyone refusing to partake of fleshly meals would be suspected of heresy. :)
“While the initial cause for Gnostic vegetarianism has been unknown in the past, many classical Christian authors have documented the Gnostic’s widespread practice of vegetarianism. In a 4th Century Christian document it attests that ‘Heretical Gnostic Christians were still so common, and there were so many Gnostic Heretics among the clergy and monks in Egypt that in the region of Theodosius, Egypt, the Patriarch Timothy made eating meat compulsory on Sundays, as a way to flush out the vegetarian Gnostics*.’”
— Luke Meyers, “Gnostic Visions” https://books.google.com/books?id=wJ6cZ6RQjuUC&pg=PT197&lpg=PT197&dq=gnostic%20vegetarians&source=bl&ots=fZnsxdHLxC&sig=MhMNuziOWvPQE3VU0tY23aQT9hM&hl=en&sa=X&ved=0CEcQ6AEwB2oVChMI76_U0Pe8yAIVyTg-Ch0bpApS#v=onepage&q=gnostic%20vegetarians&f=false