1387 To prepare for worthy reception of this sacrament (The Eucharist*), the faithful should observe the fast required in their Church. Bodily demeanor (gestures, clothing) ought to convey the respect, solemnity, and joy of this moment when Christ becomes our guest.
*(The Eucharist) Added by editor for context.
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How long should the fast be before and after receiving the holy eucharist?
I believe it is traditionally one hour.