John Trapp on 1 John 2:19

Verſe 19. But they were not of us] No more were our Antitrinitarians, Arrians, Antiſcripturiſts, ever of cur Church, other-wiſe then as wens or botches whatever our adverſaries averre and cavil. So of old, becauſe the Waldenſes and Manichees lived in the ſame places, and were both held heretikas, the Papiſts maliciouſly gave out that the Waldenſes (thoſe ancient Proteſtants) were defiled with the errours of the Manichees and Cathariſts, which yet they ever abhorred,