https://sites.google.com/site/shaftesburycatholicchurch/tough-issues/friday-abstinence/friday-abstinence-dispensations
"In individual cases, for a just reason", a parish priest can dispense one of his parishioners from the Friday abstinence (canon 1245). In addition, an illness...
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https://www.churchofjesuschrist.org/study/manual/teachings-brigham-young/chapter-14?lang=ase
Chapter 14: Dispensations of the Gospel
chapterdispensationsgospel