People who are not Catholic. Catholics is the state of mortal sin. These are the two biggies.
More information below:
In the Catholic Church, those who cannot receive the Eucharist include non-Catholics, those in a state of mortal sin, and those who have not yet received their First Holy Communion. Additionally, those who are conscious of having eaten or drunk something within the previous hour (aside from water or medicine) are also not allowed to receive.
In the church.
in a convoluted sense yes you do, its not the normal Eucharist though.
Eucharist is a form of Initiation to the church to receive God's Communion.
You must receive the Eucharist properly because it is a solemn and ancient religious ritual, and if you do not do it properly you would be showing disrespect to that tradition.
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Catholics must receive the Eucharist at least once per year during the Easter season.
Eucharist
No, a deacon cannot lead the sacrament of the Eucharist as they only assist the priest.
Who is going to know and hold you accountable if you don't confess your sins before taking the Eucharist?
When you receive the Eucharist, you remember that is is the Body and Blood of Christ, and Christ gave himself up for all of us.
The Eucharist gives one the "food of eternal life." The Eucharist also allows us to receive the Lord and shows us that we are committed to Him. The Eucharist also is the initiation into Christ's body and blood which was shed for us. Therefore Eucharist is a sacrament of Initiation.
Catholics and others are welcome to attend an Orthodox service, but they are not permitted to receive the Eucharist, as this is reserved for members of the Orthodox Faith alone.