The 64th declares those persons not to be catholics who fast upon Sunday."
Landon, E. H. (1909). In A Manual of Councils of the Holy Catholic Church. Edinburgh: John Grant.
"[DS 454] 4. If anyone does not truly honor the birthday of Christ according to the flesh, but pretends that he honors (it), fasting on the very day and on the Lord’s Day, because, like Cerdon, Marcion, Manichaeus, and Priscillian, he does not believe that Christ was born in the nature of man, let him be anathema."(Council of Braga II, 561AD)
(Anathemas against Heretics, especially the Priscillianists) Denzinger. The sources of Catholic dogma (p. 93).
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