The fast of Ashura is generally seen as voluntary (except in some Sunni traditions where it is highly recommended), whereas the fast of Yom Kippur is obligatory for Jewish adults (with exemptions for health and age).
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The fast of Ashura is generally seen as voluntary (except in some Sunni traditions where it is highly recommended), whereas the fast of Yom Kippur is obligatory for Jewish adults (with exemptions for health and age).